تعریف سازگاری اندروید 13

1. مقدمه

این سند شرایطی را که باید برای سازگاری دستگاه‌ها با Android 13 رعایت شود، برشمرده است.

استفاده از "MUST"، "MUST NOT"، "REQUIRED"، "SHALL"، "SHALL NOT"، "SHOULD"، "SHOULD NOT"، "Recommended"، "MAY" و "OPTIONAL" طبق IETF است. استاندارد تعریف شده در RFC2119 .

همانطور که در این سند استفاده می‌شود، "پیاده‌کننده دستگاه" یا "اجراکننده" شخص یا سازمانی است که راه‌حل سخت‌افزار/نرم‌افزاری را با Android 13 توسعه می‌دهد. یک "پیاده‌سازی دستگاه" یا "پیاده‌سازی" راه‌حل سخت‌افزار/نرم‌افزاری است که به این شکل توسعه یافته است.

برای اینکه پیاده‌سازی‌های دستگاه با Android 13 سازگار در نظر گرفته شوند، باید الزامات ارائه‌شده در این تعریف سازگاری، از جمله هر سندی که از طریق مرجع گنجانده شده‌اند، داشته باشند.

در مواردی که این تعریف یا تست‌های نرم‌افزاری توضیح داده شده در بخش 10 بی‌صدا، مبهم یا ناقص باشد، این مسئولیت اجرای دستگاه است که از سازگاری با پیاده‌سازی‌های موجود اطمینان حاصل کند.

به همین دلیل، پروژه متن باز اندروید هم مرجع و هم پیاده سازی ترجیحی اندروید است. به اجراکنندگان دستگاه اکیداً توصیه می‌شود که پیاده‌سازی‌های خود را تا حد ممکن بر اساس کد منبع «بالادست» موجود در پروژه منبع باز Android قرار دهند. در حالی که برخی از مؤلفه‌ها می‌توانند به صورت فرضی با پیاده‌سازی‌های جایگزین جایگزین شوند، اکیداً توصیه می‌شود که از این رویه پیروی نکنید، زیرا گذراندن آزمون‌های نرم‌افزار به طور قابل‌توجهی دشوارتر می‌شود. این مسئولیت پیاده‌کننده است که از سازگاری کامل رفتاری با پیاده‌سازی استاندارد Android، از جمله و فراتر از مجموعه تست سازگاری اطمینان حاصل کند. در نهایت، توجه داشته باشید که تعویض و اصلاح برخی از اجزا به صراحت توسط این سند ممنوع است.

بسیاری از منابع مرتبط با این سند به طور مستقیم یا غیرمستقیم از Android SDK مشتق شده اند و از نظر عملکردی با اطلاعات موجود در اسناد آن SDK یکسان خواهند بود. در هر موردی که این تعریف سازگاری یا مجموعه تست سازگاری با مستندات SDK مخالف باشد، اسناد SDK معتبر تلقی می‌شوند. هر گونه جزئیات فنی ارائه شده در منابع مرتبط در سراسر این سند با گنجاندن بخشی از این تعریف سازگاری در نظر گرفته می شود.

1.1 ساختار سند

1.1.1. الزامات بر اساس نوع دستگاه

بخش 2 شامل تمام الزاماتی است که برای یک نوع دستگاه خاص اعمال می شود. هر بخش فرعی از بخش 2 به نوع خاصی از دستگاه اختصاص دارد.

همه الزامات دیگر، که به طور جهانی برای هر پیاده سازی دستگاه Android اعمال می شود، در بخش های بعد از بخش 2 فهرست شده است. در این سند به این الزامات به عنوان "نیازهای اصلی" اشاره شده است.

1.1.2. شناسه مورد نیاز

شناسه مورد نیاز برای الزامات MUST اختصاص داده شده است.

• شناسه فقط برای الزامات MUST اختصاص داده شده است.
• الزامات STRONGLY RECOMMENDED به عنوان [SR] علامت گذاری شده اند اما شناسه اختصاص داده نشده است.
• شناسه شامل موارد زیر است: شناسه نوع دستگاه - شناسه وضعیت - شناسه مورد نیاز (به عنوان مثال C-0-1).

هر شناسه به صورت زیر تعریف می شود:

• شناسه نوع دستگاه (بیشتر را در 2. انواع دستگاه ببینید)
  • C: Core (الزاماتی که برای همه پیاده سازی های دستگاه اندروید اعمال می شود)
  • H: دستگاه Android Handheld
  • T: دستگاه Android TV
  • A: پیاده سازی Android Automotive
  • W: پیاده سازی Android Watch
  • تب: پیاده سازی تبلت اندروید
• شناسه وضعیت
  • هنگامی که شرط بدون قید و شرط باشد، این شناسه به عنوان 0 تنظیم می شود.
  • وقتی شرط شرطی است، 1 برای شرط اول اختصاص داده می شود و عدد در همان بخش و همان نوع دستگاه، 1 افزایش می یابد.
• شناسه مورد نیاز
  • این شناسه از 1 شروع می شود و در همان بخش و شرایط یکسان 1 افزایش می یابد.

1.1.3. شناسه مورد نیاز در بخش 2

شناسه های مورد نیاز در بخش 2 دارای دو بخش هستند. اولین مورد مربوط به شناسه بخش همانطور که در بالا توضیح داده شد. بخش دوم فاکتور فرم و نیاز خاص فرم-عامل را مشخص می کند.

شناسه بخش که با شناسه مورد نیاز شرح داده شده در بالا دنبال می شود.

• شناسه در بخش 2 شامل: شناسه بخش / شناسه نوع دستگاه - شناسه شرایط - شناسه مورد نیاز (به عنوان مثال 7.4.3/A-0-1).

2. انواع دستگاه

پروژه منبع باز Android یک پشته نرم افزاری را ارائه می دهد که می تواند برای انواع مختلف دستگاه ها و عوامل شکل استفاده شود. برای پشتیبانی از امنیت در دستگاه‌ها، انتظار می‌رود پشته نرم‌افزار، از جمله هر سیستم‌عامل جایگزین یا اجرای هسته جایگزین، در یک محیط امن همانطور که در بخش 9 و جاهای دیگر این CDD توضیح داده شده است اجرا شود. چند نوع دستگاه وجود دارد که اکوسیستم توزیع کاربرد نسبتاً بهتری دارند.

این بخش انواع دستگاه ها و الزامات و توصیه های اضافی قابل اجرا برای هر نوع دستگاه را شرح می دهد.

همه پیاده‌سازی‌های دستگاه Android که در هیچ یک از انواع دستگاه‌های توصیف‌شده قرار نمی‌گیرند، باید همچنان همه الزامات موجود در بخش‌های دیگر این تعریف سازگاری را برآورده کنند.

2.1 تنظیمات دستگاه

برای تفاوت‌های عمده در پیکربندی سخت‌افزار بر اساس نوع دستگاه، الزامات خاص دستگاه را که در این بخش دنبال می‌شود، ببینید.

2.2. الزامات دستی

دستگاه Android Handheld به یک پیاده سازی دستگاه اندرویدی اشاره دارد که معمولاً با نگه داشتن آن در دست استفاده می شود، مانند پخش کننده mp3، تلفن یا تبلت.

پیاده‌سازی‌های دستگاه اندروید در صورتی که تمام معیارهای زیر را داشته باشند به عنوان دستی طبقه‌بندی می‌شوند:

• منبع تغذیه ای داشته باشید که تحرک را فراهم می کند، مانند باتری.
• اندازه صفحه نمایش مورب فیزیکی در محدوده 3.3 اینچ (یا 2.5 اینچ برای پیاده سازی دستگاهی که در سطح API 29 یا قبل از آن عرضه شده است) تا 8 اینچ داشته باشید.

الزامات اضافی در بقیه این بخش مختص پیاده سازی دستگاه Android Handheld است.

2.2.1. سخت افزار

پیاده سازی دستگاه های دستی:

• [ 7.1 .1.1/H-0-1] باید حداقل یک نمایشگر سازگار با Android داشته باشد که تمام الزامات توضیح داده شده در این سند را برآورده کند.

• [ 7.1 .1.3/H-SR-1] اکیداً توصیه می شود تا امکان تغییر اندازه نمایشگر (تراکم صفحه) را به کاربران ارائه دهند.

• [ 7.1 .1.1/H-0-2] باید ترکیب GPU بافرهای گرافیکی را حداقل به اندازه بالاترین وضوح صفحه نمایش داخلی پشتیبانی کند.

اگر پیاده سازی های دستگاه دستی از چرخش صفحه نرم افزار پشتیبانی می کنند، آنها:

• [ 7.1 .1.1/H-1-1]* باید صفحه منطقی را که برای برنامه های شخص ثالث در دسترس است، حداقل 2 اینچ در لبه(های) کوتاه و 2.7 اینچ در لبه(های) بلند قرار دهد. دستگاه‌هایی که در Android API سطح 29 یا قبل از آن ارسال شده‌اند، ممکن است از این شرط مستثنی باشند.

اگر پیاده سازی های دستگاه دستی از چرخش صفحه نرم افزار پشتیبانی نمی کنند، آنها:

• [ 7.1 .1.1/H-2-1]* باید صفحه منطقی را که برای برنامه های شخص ثالث در دسترس است، حداقل 2.7 اینچ روی لبه(های) کوتاه قرار دهد. دستگاه‌هایی که در Android API سطح 29 یا قبل از آن ارسال شده‌اند، ممکن است از این شرط مستثنی باشند.

اگر پیاده‌سازی‌های دستگاه دستی از طریق Configuration.isScreenHdr() از نمایشگرهای محدوده دینامیکی بالا پشتیبانی می‌کنند، آنها:

• [ 7.1 .4.5/H-1-1] باید VK_EXT_swapchain_colorspace EGL_EXT_gl_colorspace_bt2020_pq ، EGL_EXT_surface_SMPTE2086_metadata ، EGL_EXT_surface_CTA861_3_metadata پسوندهای VK_EXT_hdr_metadata .

پیاده سازی دستگاه های دستی:

• [ 7.1 .4.6/H-0-1] باید گزارش دهد که آیا دستگاه از قابلیت نمایه سازی GPU از طریق ویژگی سیستم graphics.gpu.profiler.support پشتیبانی می کند یا خیر.

اگر پیاده‌سازی‌های دستگاه دستی از طریق ویژگی سیستم graphics.gpu.profiler.support پشتیبانی را اعلام کنند، آنها:

• [ 7.1 .4.6/H-1-1] باید یک ردیابی پروتوباف را به عنوان خروجی گزارش کند که با طرح شمارشگرهای GPU و مراحل پردازش گرافیکی تعریف شده در مستندات Perfetto مطابقت دارد.
• [ 7.1 .4.6/H-1-2] باید مقادیر منطبق را برای شمارنده‌های GPU دستگاه به دنبال پروتو بسته ردیابی شمارنده gpu گزارش کند.
• [ 7.1 .4.6/H-1-3] باید مقادیر منطبق برای GPU RenderStages دستگاه را به دنبال پروتوی بسته ردیابی مرحله رندر گزارش کند.
• [ 7.1 .4.6/H-1-4] باید یک نقطه ردیابی فرکانس GPU را همانطور که با فرمت مشخص شده گزارش کند: power/gpu_frequency .

پیاده سازی دستگاه های دستی:

• [ 7.1 .5/H-0-1] باید شامل پشتیبانی از حالت سازگاری برنامه های قدیمی همانطور که توسط کد منبع باز بالادستی Android پیاده سازی شده باشد. به این معنا که پیاده‌سازی دستگاه نباید محرک‌ها یا آستانه‌هایی را که در آن حالت سازگاری فعال می‌شود، تغییر دهند، و نباید رفتار خود حالت سازگاری را تغییر دهند.
• [ 7.2 .1/H-0-1] باید شامل پشتیبانی از برنامه های کاربردی ویرایشگر روش ورودی (IME) شخص ثالث باشد.
• [ 7.2 .3/H-0-2] باید هر دو رویداد فشار عادی و طولانی عملکرد Back ( KEYCODE_BACK ) را به برنامه پیش زمینه ارسال کند. این رویدادها نباید توسط سیستم مصرف شوند و می توانند توسط خارج از دستگاه Android (به عنوان مثال صفحه کلید سخت افزاری خارجی متصل به دستگاه Android) فعال شوند.
• [ 7.2 .3/H-0-3] باید عملکرد Home را در همه نمایشگرهای سازگار با Android که صفحه اصلی را ارائه می دهند، ارائه دهد.
• [ 7.2 .3/H-0-4] باید عملکرد Back را در همه نمایشگرهای سازگار با Android و عملکرد Recents را در حداقل یکی از نمایشگرهای سازگار با Android ارائه دهد.
• [ 7.2.4 /H-0-1] باید از ورودی صفحه لمسی پشتیبانی کند.
• [ 7.2 .4/H-SR-1] برای راه‌اندازی برنامه کمکی انتخاب‌شده توسط کاربر، به عبارت دیگر برنامه‌ای که VoiceInteractionService یا فعالیتی که ACTION_ASSIST را با فشار طولانی KEYCODE_MEDIA_PLAY_PAUSE یا KEYCODE_HEADSETHOOK برای فعالیت‌های زمینه، اجرا می‌کند، به شدت توصیه می‌شود. آن رویدادهای مطبوعاتی طولانی را مدیریت نمی کند.
• [ 7.3 .1/H-SR-1] اکیداً توصیه می‌شود که شتاب‌سنج 3 محوره را در خود جای دهید.

اگر پیاده سازی های دستگاه دستی شامل شتاب سنج 3 محوره باشد، آنها:

• [ 7.3 .1/H-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.

اگر پیاده‌سازی‌های دستگاه دستی شامل گیرنده GPS/GNSS باشد و قابلیت آن را از طریق پرچم ویژگی android.hardware.location.gps به برنامه‌ها گزارش کند، آنها:

• [ 7.3 .3/H-2-1] باید اندازه گیری های GNSS را به محض یافتن گزارش کند، حتی اگر مکان محاسبه شده از GPS/GNSS هنوز گزارش نشده باشد.
• [ 7.3 0.3/H-2-2] باید مقادیر شبه و نرخ شبه GNSS را گزارش کند، که در شرایط آسمان باز پس از تعیین مکان، در حالی که ساکن یا حرکت با شتاب کمتر از 0.2 متر بر ثانیه مجذور شتاب، برای محاسبه کافی است. موقعیت در 20 متر، و سرعت در 0.2 متر در ثانیه، حداقل 95٪ از زمان.

اگر پیاده سازی های دستگاه دستی شامل یک ژیروسکوپ 3 محوره باشد، آنها:

• [ 7.3 .4/H-3-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.
• [ 7.3 .4/H-3-2] باید قادر به اندازه گیری تغییرات جهت تا 1000 درجه در ثانیه باشد.

پیاده سازی های دستگاه دستی که می توانند تماس صوتی برقرار کنند و هر مقداری غیر از PHONE_TYPE_NONE در getPhoneType نشان دهند:

• [ 7.3 .8/H] باید دارای حسگر مجاورت باشد.

پیاده سازی دستگاه های دستی:

• [ 7.3 .11/H-SR-1] برای پشتیبانی از حسگر پوز با 6 درجه آزادی به شدت توصیه می شود.
• [ 7.4 .3/H] باید شامل پشتیبانی از بلوتوث و بلوتوث LE باشد.

اگر دستگاه‌ها با اعلام PackageManager.FEATURE_WIFI_AWARE و مکان Wi-Fi (زمان رفت و برگشت Wi-Fi — RTT) با اعلام PackageManager.FEATURE_WIFI_RTT از پروتکل WiFi Neighbor Awareness Networking (NAN) پشتیبانی می‌کنند، آن‌گاه:

• [ 7.4 0.2.5/H-1-1] باید محدوده را به دقت در محدوده +/-1 متر در پهنای باند 160 مگاهرتز در صدک 68 (همانطور که با تابع توزیع تجمعی محاسبه می شود)، +/-2 متر در پهنای باند 80 مگاهرتز گزارش کند. در صدک 68، +/-4 متر در پهنای باند 40 مگاهرتز در صدک 68، و +/-8 متر در پهنای باند 20 مگاهرتز در صدک 68 در فواصل 10 سانتی متر، 1 متر، 3 متر و 5 متر، به عنوان از طریق WifiRttManager#startRanging Android API مشاهده شده است.

• [ 7.4 .2.5/H-SR-1] اکیداً توصیه می شود که محدوده را به طور دقیق در محدوده +/-1 متر در پهنای باند 160 مگاهرتز در صدک 90 (همانطور که با تابع توزیع تجمعی محاسبه می شود)، +/-2 متر در پهنای باند 80 مگاهرتز در صدک 90، +/-4 متر در پهنای باند 40 مگاهرتز در صدک 90، و +/-8 متر در پهنای باند 20 مگاهرتز در صدک 90 در فواصل 10 سانتی‌متر، همانطور که از طریق WifiRttManager#st مشاهده شده است. API .

اکیداً توصیه می شود مراحل تنظیم اندازه گیری مشخص شده در کالیبراسیون حضور را دنبال کنید.

اگر پیاده‌سازی‌های دستگاه دستی شامل یک دستگاه دوربین منطقی باشد که قابلیت‌ها را با استفاده از CameraMetadata.REQUEST_AVAILABLE_CAPABILITIES_LOGICAL_MULTI_CAMERA فهرست می‌کند.REQUEST_AVAILABLE_CAPABILITIES_LOGICAL_MULTI_CAMERA، آنها:

• [ 7.5 0.4/H-1-1] باید به طور پیش فرض میدان دید طبیعی (FOV) داشته باشد و باید بین 50 تا 95 درجه باشد.

پیاده سازی دستگاه های دستی:

• [ 7.6 .1/H-0-1] باید حداقل 4 گیگابایت فضای ذخیره سازی غیرفرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") در دسترس باشد.
• [ 7.6 .1/H-0-2] باید برای ActivityManager.isLowRamDevice() "true" را زمانی که کمتر از 1 گیگابایت حافظه در اختیار هسته و فضای کاربر وجود دارد، برگرداند.

اگر پیاده‌سازی‌های دستگاه دستی فقط از ABI 32 بیتی پشتیبانی می‌کنند:

• [ 7.6 .1/H-1-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 416 مگابایت باشد اگر نمایشگر پیش فرض از وضوح فریم بافر تا qHD (مثلاً FWVGA) استفاده می کند.

• [ 7.6 .1/H-2-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 592 مگابایت باشد اگر نمایشگر پیش‌فرض از وضوح فریم بافر تا HD+ استفاده می‌کند (مثلاً HD، WSVGA).

• [ 7.6 .1/H-3-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 896 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا FHD استفاده می کند (به عنوان مثال WSXGA+).

• [ 7.6 .1/H-4-1] اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا QHD (به عنوان مثال QWXGA) استفاده می کند، حافظه موجود برای هسته و فضای کاربر باید حداقل 1344 مگابایت باشد.

اگر پیاده‌سازی‌های دستگاه دستی از هر ABI 64 بیتی (با یا بدون هیچ ABI 32 بیتی) پشتیبانی می‌کنند:

• [ 7.6 .1/H-5-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 816 مگابایت باشد اگر نمایشگر پیش‌فرض از وضوح فریم بافر تا qHD (به عنوان مثال FWVGA) استفاده می‌کند.

• [ 7.6 .1/H-6-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 944 مگابایت باشد اگر نمایشگر پیش‌فرض از وضوح فریم بافر تا HD+ استفاده می‌کند (مثلاً HD، WSVGA).

• [ 7.6 .1/H-7-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 1280 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا FHD استفاده می کند (به عنوان مثال WSXGA+).

• [ 7.6 .1/H-8-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 1824 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا QHD (مثلا QWXGA) استفاده می کند.

توجه داشته باشید که "حافظه در دسترس برای هسته و فضای کاربر" در بالا به فضای حافظه ارائه شده به اضافه هر حافظه ای که قبلاً به اجزای سخت افزاری مانند رادیو، ویدئو و غیره اختصاص داده شده است که در پیاده سازی های دستگاه تحت کنترل هسته نیستند، اشاره دارد.

اگر پیاده‌سازی‌های دستگاه دستی شامل کمتر یا مساوی 1 گیگابایت حافظه در دسترس هسته و فضای کاربر باشد، آنها:

• [ 7.6 .1/H-9-1] باید پرچم ویژگی android.hardware.ram.low را اعلام کند.
• [ 7.6 .1/H-9-2] باید حداقل 1.1 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") داشته باشد.

اگر پیاده سازی های دستگاه دستی شامل بیش از 1 گیگابایت حافظه در دسترس هسته و فضای کاربر باشد، آنها:

• [ 7.6 .1/H-10-1] باید حداقل 4 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") در دسترس باشد.
• باید پرچم ویژگی android.hardware.ram.normal را اعلام کند.

اگر پیاده‌سازی‌های دستگاه دستی شامل حافظه بیشتر یا مساوی 2 گیگابایت و کمتر از 4 گیگابایت در اختیار هسته و فضای کاربر باشد، آنها:

• [7.6.1/H-SR-1] اکیداً برای پشتیبانی از فضای کاربری 32 بیتی (هم برنامه ها و هم کد سیستم) توصیه می شود.

اگر پیاده سازی های دستگاه دستی شامل کمتر از 2 گیگابایت حافظه در دسترس هسته و فضای کاربر باشد، آنها:

• [7.6.1/H-1-1] باید فقط از یک ABI (فقط 64 بیتی یا فقط 32 بیتی) پشتیبانی کند.

پیاده سازی دستگاه های دستی:

• [ 7.6 .2/H-0-1] نباید یک برنامه ذخیره سازی مشترک کوچکتر از 1 گیگابایت ارائه کند.
• [ 7.7.1 /H] باید دارای یک درگاه USB باشد که از حالت جانبی پشتیبانی می کند.

اگر پیاده سازی های دستگاه دستی شامل یک پورت USB باشد که از حالت جانبی پشتیبانی می کند، آنها:

• [ 7.7 .1/H-1-1] باید API Android Open Accessory (AOA) را پیاده سازی کند.

اگر پیاده‌سازی‌های دستگاه دستی شامل یک پورت USB باشد که از حالت میزبان پشتیبانی می‌کند، آنها:

• [ 7.7 .2/H-1-1] باید کلاس صوتی USB را همانطور که در مستندات Android SDK مستند شده است پیاده سازی کند.

پیاده سازی دستگاه های دستی:

• [ 7.8 .1/H-0-1] باید دارای میکروفون باشد.
• [ 7.8 .2/H-0-1] باید یک خروجی صدا داشته باشد و android.hardware.audio.output را اعلام کند.

اگر پیاده‌سازی‌های دستگاه دستی قادر به برآورده کردن تمام الزامات عملکرد برای پشتیبانی از حالت VR و شامل پشتیبانی از آن باشند، آنها:

• [ 7.9 .1/H-1-1] باید پرچم ویژگی android.hardware.vr.high_performance را اعلام کند.
• [ 7.9 .1/H-1-2] باید شامل برنامه ای باشد که android.service.vr.VrListenerService را اجرا می کند که می تواند توسط برنامه های VR از طریق android.app.Activity#setVrModeEnabled فعال شود.

اگر پیاده‌سازی‌های دستگاه دستی شامل یک یا چند پورت USB-C در حالت میزبان و پیاده‌سازی (کلاس صوتی USB)، علاوه بر الزامات بخش 7.7.2 ، آنها:

• [ 7.8 .2.2/H-1-1] باید نقشه نرم افزاری زیر را از کدهای HID ارائه کند:

• [ 7.8 .2.2/H-1-2] باید ACTION_HEADSET_PLUG را روی یک درج پلاگین راه اندازی کند، اما فقط پس از اینکه رابط های صوتی USB و نقاط پایانی به درستی شمارش شدند تا نوع ترمینال متصل شده را شناسایی کنید.

هنگامی که ترمینال صوتی USB نوع 0x0302 شناسایی شد، آنها:

• [ 7.8 .2.2/H-2-1] باید Intent ACTION_HEADSET_PLUG را با «میکروفون» اضافی روی 0 پخش کند.

هنگامی که ترمینال صوتی USB نوع 0x0402 شناسایی شد، آنها:

• [ 7.8 .2.2/H-3-1] باید Intent ACTION_HEADSET_PLUG را با «میکروفون» اضافی روی 1 پخش کند.

هنگامی که API AudioManager.getDevices () فراخوانی می شود در حالی که دستگاه جانبی USB متصل است، آنها:

• [ 7.8 .2.2/H-4-1] اگر فیلد نوع پایانه صوتی USB 0x0302 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_HEADSET و نقش isSink() را فهرست کند.

• [ 7.8 .2.2/H-4-2] اگر فیلد نوع پایانه صوتی USB 0x0402 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_HEADSET و نقش isSink() را فهرست کند.

• [ 7.8 .2.2/H-4-3] اگر فیلد نوع پایانه صوتی USB 0x0402 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_HEADSET و نقش isSource() را فهرست کند.

• [ 7.8 .2.2/H-4-4] اگر فیلد نوع پایانه صوتی USB 0x603 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_DEVICE و نقش isSink() را فهرست کند.

• [ 7.8 .2.2/H-4-5] اگر فیلد نوع پایانه صوتی USB 0x604 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_DEVICE و نقش isSource() را فهرست کند.

• [ 7.8 .2.2/H-4-6] اگر فیلد نوع پایانه صوتی USB 0x400 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_DEVICE و نقش isSink() را فهرست کند.

• [ 7.8 .2.2/H-4-7] اگر فیلد نوع پایانه صوتی USB 0x400 باشد، باید دستگاهی از نوع AudioDeviceInfo.TYPE_USB_DEVICE و نقش isSource() را فهرست کند.

• [ 7.8 .2.2/H-SR-1] برای انجام شمارش توصیفگرهای USB، شناسایی انواع ترمینال و پخش Intent ACTION_HEADSET_PLUG در کمتر از 1000 میلی ثانیه، پس از اتصال یک دستگاه صوتی USB-C به شدت توصیه می شود.

اگر پیاده‌سازی‌های دستگاه دستی android.hardware.audio.output و android.hardware.microphone را اعلام کنند، آنها:

• [ 5.6 /H-1-1] باید میانگین تأخیر رفت و برگشت پیوسته 500 میلی ثانیه یا کمتر در 5 اندازه گیری، با میانگین انحراف مطلق کمتر از 50 میلی ثانیه، در مسیرهای داده زیر داشته باشد: "بلندگو به میکروفون"، 3.5 آداپتور حلقه بک mm (در صورت پشتیبانی)، USB loopback (در صورت پشتیبانی).

• [ 5.6 /H-1-2] باید میانگین تأخیر ضربه به تن 500 میلی ثانیه یا کمتر در حداقل 5 اندازه گیری در مسیر داده بلندگو به میکروفون داشته باشد.

اگر پیاده‌سازی‌های دستگاه دستی شامل حداقل یک محرک لمسی باشد، آنها:

• [ 7.10 /H]* نباید از محرک لمسی (ویبراتور) جرم دوار غیرعادی (ERM) استفاده کرد.
• [ 7.10 /H]* باید محل قرارگیری محرک را در نزدیکی محلی قرار دهد که معمولاً دستگاه را با دست نگه داشته یا لمس می‌کند.
• [ 7.10 /H]* باید همه ثابت‌های عمومی را برای لمسی واضح در android.view پیاده‌سازی کند ، تأیید، رد، GESTURE_START و GESTURE_END).
• [ 7.10 /H]* باید همه ثابت‌های عمومی را برای لمسی واضح در android.os.VibrationEffect پیاده‌سازی کند، یعنی (EFFECT_TICK، EFFECT_CLICK، EFFECT_HEAVY_CLICK و EFFECT_DOUBLE_CLICK) و همه ثابت‌های عمومی امکان‌پذیر PRIMITIVE_* . CLICK، TICK، LOW_TICK، QUICK_FALL، QUICK_RISE، SLOW_RISE، SPIN، THUD). برخی از این موارد اولیه، مانند LOW_TICK و SPIN ممکن است تنها در صورتی امکان پذیر باشند که ویبراتور بتواند فرکانس های نسبتا پایین را پشتیبانی کند.

• [7.10/H]* باید دستورالعمل نگاشت ثابت های عمومی در android.view.HapticFeedbackConstants به ثابت های توصیه شده android.os.VibrationEffect ، با روابط دامنه مربوطه را دنبال کنید.

• [ 7.10 /H]* باید ارزیابی کیفیت برای APIهای createOneShot() و createWaveform() را دنبال کند.

• [ 7.10 /H]* باید بررسی کند که نتیجه API عمومی android.os.Vibrator.hasAmplitudeControl() به درستی قابلیت های ویبراتور آنها را منعکس می کند.

محرک رزونانس خطی (LRA) یک سیستم فنر تک جرمی است که دارای فرکانس تشدید غالب است که در آن جرم در جهت حرکت مورد نظر ترجمه می شود.

اگر پیاده‌سازی‌های دستگاه دستی شامل حداقل یک محرک تشدید خطی باشد، آنها:

• [ 7.10 /H]* باید محرک لمسی را در محور X (چپ-راست) جهت عمودی حرکت دهد.

اگر پیاده‌سازی‌های دستگاه دستی دارای یک محرک لمسی باشد که محرک تشدید خطی محور X (LRA) است، آنها:

• [ 7.10 /H]* باید فرکانس تشدید LRA محور X کمتر از 200 هرتز باشد.

اگر پیاده سازی دستگاه های دستی از نگاشت ثابت های لمسی پیروی کنند، آنها:

• [ 7.10 /H]* باید وضعیت پیاده سازی را با اجرای API های android.os.Vibrator.areAllEffectsSupported() و android.os.Vibrator.arePrimitivesSupported() تأیید کند.

• [ 7.10 /H]* باید یک ارزیابی کیفیت برای ثابت های لمسی انجام دهد.

• [ 7.10 /H]* باید در صورت نیاز پیکربندی بازگشتی را برای موارد اولیه پشتیبانی نشده همانطور که در راهنمای پیاده سازی برای ثابت ها توضیح داده شده است تأیید و به روز کند.

2.2.2. چند رسانه ای

پیاده سازی دستگاه های دستی باید فرمت های رمزگذاری و رمزگشایی صوتی زیر را پشتیبانی کرده و آنها را برای برنامه های شخص ثالث در دسترس قرار دهند:

• [ 5.1 /H-0-1] AMR-NB
• [ 5.1 /H-0-2] AMR-WB
• [ 5.1 /H-0-3] نمایه AAC MPEG-4 (AAC LC)
• [ 5.1 /H-0-4] نمایه MPEG-4 HE AAC (AAC+)
• [ 5.1 /H-0-5] AAC ELD (AAC تاخیر کم تقویت شده)

پیاده سازی دستگاه های دستی باید از فرمت های رمزگذاری ویدیوی زیر پشتیبانی کرده و آنها را برای برنامه های شخص ثالث در دسترس قرار دهند:

• [ 5.2 /H-0-1] H.264 AVC
• [ 5.2 /H-0-2] VP8

پیاده سازی دستگاه های دستی باید از فرمت های رمزگشایی ویدیوی زیر پشتیبانی کرده و آنها را برای برنامه های شخص ثالث در دسترس قرار دهند:

• [ 5.3 /H-0-1] H.264 AVC
• [ 5.3 /H-0-2] H.265 HEVC
• [ 5.3 /H-0-3] MPEG-4 SP
• [ 5.3 /H-0-4] VP8
• [ 5.3 /H-0-5] VP9

2.2.3. نرم افزار

پیاده سازی دستگاه های دستی:

• [ 3.2.3.1 /H-0-1] باید برنامه‌ای داشته باشد که اهداف ACTION_GET_CONTENT ، ACTION_OPEN_DOCUMENT ، ACTION_OPEN_DOCUMENT_TREE ، و ACTION_CREATE_DOCUMENT را همانطور که در اسناد SDK توضیح داده شده است، مدیریت کند و با استفاده از امکان دسترسی به DocumentsProvider API اطلاعات کاربر را فراهم کند.
• [ 3.2.3.1 /H-0-2]* باید یک یا چند برنامه یا مؤلفه خدمات را با یک کنترل کننده هدف، برای همه الگوهای فیلتر هدف عمومی تعریف شده توسط اهداف برنامه زیر که در اینجا ذکر شده است، از قبل بارگیری کنید.
• [ 3.2.3.1 /H-SR-1] برای از پیش بارگذاری یک برنامه ایمیل که می تواند ACTION_SENDTO یا ACTION_SEND یا ACTION_SEND_MULTIPLE قصد ارسال ایمیل را مدیریت کند، اکیداً توصیه می شود.
• [ 3.4 .1/H-0-1] باید اجرای کاملی از android.webkit.Webview API را ارائه دهد.
• [ 3.4 .2/H-0-1] باید شامل یک برنامه مرورگر مستقل برای مرور وب کاربران عمومی باشد.
• [ 3.8 .1/H-SR-1] برای اجرای یک راه‌انداز پیش‌فرض که از پین کردن میان‌برها، ویجت‌ها و ویژگی‌های ویجت در برنامه پشتیبانی می‌کند، به شدت توصیه می‌شود.
• [ 3.8 .1/H-SR-2] برای پیاده‌سازی یک راه‌انداز پیش‌فرض که دسترسی سریع به میانبرهای اضافی ارائه‌شده توسط برنامه‌های شخص ثالث را از طریق ShortcutManager API فراهم می‌کند، اکیداً توصیه می‌شود.
• [ 3.8 .1/H-SR-3] اکیداً توصیه می‌شود که یک برنامه راه‌انداز پیش‌فرض که نشان‌ها را برای نمادهای برنامه نشان می‌دهد، داشته باشند.
• [ 3.8 .2/H-SR-1] برای پشتیبانی از ویجت های برنامه شخص ثالث به شدت توصیه می شود.
• [ 3.8 .3/H-0-1] باید به برنامه های شخص ثالث اجازه دهد تا از طریق کلاس های Notification و NotificationManager API کاربران را از رویدادهای قابل توجه مطلع کنند.
• [ 3.8 .3/H-0-2] باید از اعلان های غنی پشتیبانی کند.
• [ 3.8 .3/H-0-3] باید از اعلان‌های heads-up پشتیبانی کند.
• [ 3.8 .3/H-0-4] باید شامل یک سایه اعلان باشد که به کاربر امکان کنترل مستقیم (مثلاً پاسخ، به تعویق انداختن، رد کردن، مسدود کردن) اعلان‌ها را از طریق هزینه‌های کاربر مانند دکمه‌های عمل یا پانل کنترل همانطور که اجرا می‌کند، می‌دهد. در AOSP
• [ 3.8 .3/H-0-5] باید انتخاب های ارائه شده از طریق RemoteInput.Builder setChoices() در سایه اعلان نمایش دهد.
• [ 3.8 .3/H-SR-1] اکیداً توصیه می شود که اولین انتخاب ارائه شده از طریق RemoteInput.Builder setChoices() در سایه اعلان و بدون تعامل اضافی با کاربر نمایش داده شود.
• [ 3.8 .3/H-SR-2] اکیداً توصیه می‌شود که همه گزینه‌های ارائه شده از طریق RemoteInput.Builder setChoices() در سایه اعلان‌ها هنگامی که کاربر همه اعلان‌ها را در سایه اعلان گسترش می‌دهد، نمایش داده شود.
• [ 3.8 .3.1/H-SR-1] برای نمایش اقداماتی که Notification.Action.Builder.setContextual برای آنها به عنوان true در خط با پاسخ های نمایش داده شده توسط Notification.Remoteinput.Builder.setChoices تنظیم شده است، قویاً توصیه می شود.
• [ 3.8 .4/H-SR-1] اکیداً توصیه می شود یک دستیار را روی دستگاه اجرا کنید تا عمل Assist را انجام دهد.

اگر پیاده سازی های دستگاه دستی از اعلان های MediaStyle پشتیبانی می کنند:

• [ 3.8 .3.1/H-SR-2] به شدت توصیه می‌شود تا یک مقرون به صرفه برای کاربر (به عنوان مثال، سوئیچ‌کننده خروجی) که از رابط کاربری سیستم قابل دسترسی است که به کاربران امکان می‌دهد بین مسیرهای رسانه‌ای موجود (مثلاً دستگاه‌های بلوتوث و مسیرهای ارائه‌شده به) سوئیچ کنند، ارائه کنند. MediaRouter2Manager ) زمانی که یک برنامه اعلان MediaStyle را با توکن MediaSession ارسال می کند.

اگر پیاده‌سازی‌های دستگاه دستی از عمل Assist پشتیبانی می‌کنند، آنها:

• [ 3.8 .4/H-SR-2] اکیداً توصیه می شود از فشار طولانی کلید HOME به عنوان تعامل تعیین شده برای راه اندازی برنامه کمکی همانطور که در بخش 7.2.3 توضیح داده شده است، استفاده کنید. باید برنامه کمکی انتخاب شده توسط کاربر را راه‌اندازی کند، به عبارت دیگر برنامه‌ای که VoiceInteractionService یا فعالیتی را که هدف ACTION_ASSIST مدیریت می‌کند، اجرا می‌کند.

اگر پیاده‌سازی‌های دستگاه دستی از conversation notifications پشتیبانی می‌کنند و آن‌ها را در بخش جداگانه‌ای از اعلان‌های هشدار و بدون مکالمه گروه‌بندی می‌کنند، آنها:

• [ 3.8 .4/H-1-1]* باید اعلان‌های مکالمه را قبل از اعلان‌های غیرمکالمه نمایش دهد، به استثنای اعلان‌های سرویس پیش‌زمینه و اعلان‌های اهمیت: بالا .

اگر پیاده‌سازی‌های دستگاه Android Handheld از صفحه قفل پشتیبانی می‌کنند، آنها:

• [ 3.8 .10/H-1-1] باید اعلان‌های صفحه قفل از جمله الگوی اعلان رسانه را نمایش دهد.

اگر پیاده سازی های دستگاه دستی از صفحه قفل ایمن پشتیبانی می کنند، آنها:

• [ 3.9 /H-1-1] باید طیف کاملی از خط‌مشی‌های مدیریت دستگاه را که در مستندات Android SDK تعریف شده است، اجرا کند.

اگر پیاده‌سازی‌های دستگاه دستی شامل پشتیبانی از ControlsProviderService و Control API باشد و به برنامه‌های شخص ثالث اجازه انتشار کنترل‌های دستگاه را بدهد، آن‌ها:

• [ 3.8 .16/H-1-1] باید ویژگی flag android.software.controls را اعلام کرده و آن را روی true تنظیم کند.
• [ 3.8 .16/H-1-2] باید امکان افزودن، ویرایش، انتخاب و اجرای کنترل های دستگاه مورد علاقه کاربر را از کنترل های ثبت شده توسط برنامه های شخص ثالث از طریق ControlsProviderService و Control API ها فراهم کند. .
• [ 3.8 0.16/H-1-3] باید دسترسی به این مقرون به صرفه کاربر را در سه تعامل از یک راه‌انداز پیش‌فرض فراهم کند.

• [ 3.8 .16/H-1-4] باید نام و نماد هر برنامه شخص ثالثی که کنترل‌ها را از طریق ControlsProviderService API و همچنین فیلدهای مشخص شده توسط Control APIها ارائه می‌کند، در این اطلاعات کاربر به دقت ارائه شود.

• [ 3.8 .16/H-1-5] باید امکانی را برای کاربر فراهم کند تا از کنترل‌های دستگاه‌های بی‌اهمیت تعیین‌شده برنامه از کنترل‌های ثبت‌شده توسط برنامه‌های شخص ثالث از طریق ControlsProviderService و Control Control.isAuthRequired API استفاده کند.

برعکس، اگر پیاده‌سازی‌های دستگاه دستی چنین کنترل‌هایی را اجرا نکنند، آنها:

• [ 3.8 .16/H-2-1] باید برای ControlsProviderService و Control APIها null گزارش شود.
• [ 3.8 .16/H-2-2] باید ویژگی flag android.software.controls را اعلام کرده و آن را روی false تنظیم کنید.

اگر پیاده‌سازی‌های دستگاه دستی در حالت کار قفل اجرا نمی‌شوند، وقتی محتوا در کلیپ‌بورد کپی می‌شود، آنها:

• [3.8.17/H-1-1] باید تأییدیه ای به کاربر ارائه کند که داده ها در کلیپ بورد کپی شده اند (به عنوان مثال، یک تصویر کوچک یا هشدار از "محتوا کپی شده است."). علاوه بر این، در اینجا یک نشانه همگام‌سازی داده‌های کلیپ‌بورد در بین دستگاه‌ها اضافه کنید.

پیاده سازی دستگاه های دستی:

• [ 3.10 /H-0-1] باید از خدمات دسترسی شخص ثالث پشتیبانی کند.
• [ 3.10 /H-SR-1] اکیداً توصیه می‌شود که سرویس‌های دسترس‌پذیری را در دستگاه از قبل بارگذاری کنند که با عملکردهای دسترسی سوئیچ و TalkBack (برای زبان‌هایی که توسط موتور از پیش نصب شده تبدیل متن به گفتار پشتیبانی می‌شوند) قابل مقایسه یا فراتر از آن است. پروژه منبع باز تاک بک
• [ 3.11 /H-0-1] باید از نصب موتورهای TTS شخص ثالث پشتیبانی کند.
• [ 3.11 /H-SR-1] اکیداً توصیه می‌شود که موتور TTS را شامل شود که از زبان‌های موجود در دستگاه پشتیبانی می‌کند.
• [ 3.13 /H-SR-1] اکیداً توصیه می‌شود که شامل یک مؤلفه رابط کاربری تنظیمات سریع باشد.

اگر پیاده‌سازی‌های دستگاه دستی Android پشتیبانی از FEATURE_BLUETOOTH یا FEATURE_WIFI را اعلام کنند، آنها:

• [ 3.16 /H-1-1] باید از ویژگی جفت شدن دستگاه همراه پشتیبانی کند.

اگر عملکرد پیمایش به‌عنوان یک عمل مبتنی بر اشاره روی صفحه ارائه شود:

• [ 7.2 .3/H] منطقه تشخیص حرکت برای عملکرد Home نباید از پایین صفحه در ارتفاع بالاتر از 32 dp باشد.

اگر پیاده سازی های دستگاه دستی یک عملکرد ناوبری را به عنوان یک حرکت از هر نقطه در لبه های چپ و راست صفحه ارائه می دهند:

• [ 7.2 .3/H-0-1] ناحیه اشاره عملکرد ناوبری باید کمتر از 40 dp در عرض در هر طرف باشد. پهنای ژست باید به طور پیش فرض 24 dp باشد.

اگر پیاده‌سازی‌های دستگاه دستی از یک صفحه قفل امن پشتیبانی می‌کنند و بیش از یا مساوی 2 گیگابایت حافظه در اختیار هسته و فضای کاربر دارند، آنها:

• [3.9/H-1-2] باید پشتیبانی از نمایه های مدیریت شده را از طریق پرچم ویژگی android.software.managed_users اعلام کند.

اگر پیاده‌سازی‌های دستگاه دستی اندروید پشتیبانی از دوربین را از طریق android.hardware.camera.any اعلام کنند، آنها:

• [ 7.5 .4/H-1-1] باید به قصد android.media.action.STILL_IMAGE_CAMERA و android.media.action.STILL_IMAGE_CAMERA_SECURE احترام بگذارد و دوربین را در حالت تصویر ثابت همانطور که در SDK توضیح داده شده راه اندازی کند.
• [ 7.5 .4/H-1-2] باید به قصد android.media.action.VIDEO_CAMERA برای راه‌اندازی دوربین در حالت ویدئو همانطور که در SDK توضیح داده شده است، احترام بگذارد.

اگر برنامه تنظیمات پیاده‌سازی دستگاه دستی با استفاده از تعبیه فعالیت، یک عملکرد تقسیم را پیاده‌سازی می‌کند، آن‌گاه آنها:

• [3.2.3.1/ H-1-1] باید فعالیتی داشته باشد که هنگام روشن بودن عملکرد تقسیم، هدف Settings#ACTION_SETTINGS_EMBED_DEEP_LINK_ACTIVITY را کنترل کند. فعالیت باید توسط android.permission.LAUNCH_MULTI_PANE_SETTINGS_DEEP_LINK محافظت شود و باید فعالیت Intent تجزیه شده از تنظیمات#EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_INTENT_URI شروع شود.

2.2.4. عملکرد و قدرت

• [ 8.1 /H-0-1] تأخیر فریم ثابت . تأخیر ناسازگار فریم یا تأخیر در ارائه فریم‌ها نباید بیشتر از 5 فریم در ثانیه اتفاق بیفتد و باید کمتر از 1 فریم در ثانیه باشد.
• [ 8.1 /H-0-2] تأخیر رابط کاربری . پیاده‌سازی‌های دستگاه باید با پیمایش فهرستی از 10 هزار ورودی فهرست که توسط مجموعه تست سازگاری Android (CTS) در کمتر از 36 ثانیه تعریف شده است، تجربه کاربر با تأخیر کم را تضمین کنند.
• [ 8.1 /H-0-3] تعویض وظیفه . هنگامی که چندین برنامه راه اندازی شده اند، راه اندازی مجدد یک برنامه از قبل در حال اجرا پس از راه اندازی باید کمتر از 1 ثانیه طول بکشد.

پیاده سازی دستگاه های دستی:

• [ 8.2 /H-0-1] باید عملکرد نوشتن متوالی حداقل 5 مگابایت بر ثانیه را تضمین کند.
• [ 8.2 /H-0-2] باید از عملکرد نوشتن تصادفی حداقل 0.5 مگابایت بر ثانیه اطمینان حاصل کند.
• [ 8.2 /H-0-3] باید عملکرد خواندن متوالی حداقل 15 مگابایت بر ثانیه را تضمین کند.
• [ 8.2 /H-0-4] باید عملکرد خواندن تصادفی حداقل 3.5 مگابایت بر ثانیه را تضمین کند.

اگر پیاده‌سازی‌های دستگاه دستی شامل ویژگی‌هایی برای بهبود مدیریت انرژی دستگاه باشد که در AOSP گنجانده شده است یا ویژگی‌های موجود در AOSP را گسترش دهد، آنها:

• [ 8.3 /H-1-1] باید توانایی کاربر را برای فعال و غیرفعال کردن ویژگی صرفه جویی باتری فراهم کند.
• [ 8.3 /H-1-2] باید برای نمایش همه برنامه‌هایی که از حالت‌های ذخیره انرژی برنامه و Doze معاف هستند، امکانات لازم را برای کاربر فراهم کند.

پیاده سازی دستگاه های دستی:

• [ 8.4 /H-0-1] باید یک پروفایل قدرت در هر جزء را فراهم کند که مقدار مصرف فعلی را برای هر مؤلفه سخت افزاری و تخلیه تقریبی باتری ناشی از قطعات در طول زمان تعریف کند ، همانطور که در سایت پروژه منبع باز اندروید ثبت شده است.
• [ 8.4 /H-0-2] باید تمام مقادیر مصرف برق را در ساعات میلی لیتر (MAH) گزارش دهد.
• [ 8.4 /H-0-3] باید مصرف انرژی CPU را در مورد UID هر فرآیند گزارش دهد. پروژه منبع باز اندروید از طریق اجرای ماژول هسته uid_cputime با این نیاز برآورده می شود.
• [ 8.4 /H-0-4] باید این استفاده از برق را از طریق دستور adb shell dumpsys batterystats Shell Dumpsys به توسعه دهنده برنامه در دسترس قرار دهد.
• [ 8.4 /h] در صورت عدم امکان استفاده از انرژی مؤلفه سخت افزار به یک برنامه ، باید به خود مؤلفه سخت افزار نسبت داده شود.

اگر پیاده سازی دستگاه های دستی شامل یک صفحه نمایش یا خروجی ویدیو باشد ، آنها:

• [ 8.4 /H-1-1] باید از android.intent.action.POWER_USAGE_SUMMARY هدف خودداری کنید و یک منوی تنظیمات را نمایش دهید که این استفاده از قدرت را نشان می دهد.

پیاده سازی دستگاه های دستی:

• [ 8.5 /h-0-1] باید با امکان متوقف کردن برنامه ای که یک سرویس پیش زمینه را اجرا می کند و تمام برنامه هایی را که دارای خدمات پیش زمینه فعال و مدت زمان هر یک از این سرویس ها هستند ، از زمان استفاده از برنامه های کاربردی استفاده کنید ، در منوی تنظیمات فراهم کنید. همانطور که در سند SDK شرح داده شده است.
  • برخی از برنامه ها ممکن است از متوقف شدن یا ذکر شدن در چنین هزینه کاربر که در سند SDK شرح داده شده است ، معاف شوند.

2.2.5. مدل امنیتی

پیاده سازی دستگاه های دستی:

• [ 9.1 /H-0-1] باید به برنامه های شخص ثالث اجازه دهد تا از طریق android.permission.PACKAGE_USAGE_STATS به آمار استفاده دسترسی پیدا کنند و یک مکانیزم قابل دسترسی کاربر را برای اعطای یا لغو دسترسی به چنین برنامه هایی در پاسخ به android.settings.ACTION_USAGE_ACCESS_SETTINGS فراهم کنند. android.settings.ACTION_USAGE_ACCESS_SETTINGS قصد.

پیاده سازی دستگاه های دستی:

• [ 9.11 /H-0-2] باید از اجرای کلیدی با یک محیط اجرای جدا شده پشتیبان تهیه کنید.
• [ 9.11 /H-0-3] باید الگوریتم های رمزنگاری RSA ، AES ، ECDSA و HMAC و عملکردهای هش Family MD5 ، Sha1 و Sha-2 را برای پشتیبانی صحیح از الگوریتم های پشتیبانی شده سیستم کلیدی اندرویدی در منطقه ای که به طور ایمن پشتیبانی می کند ، داشته باشد. جدا شده از کد در حال اجرا بر روی هسته و بالاتر. جداسازی ایمن باید تمام مکانیسم های بالقوه را که توسط آن هسته یا کد فضای کاربری ممکن است به وضعیت داخلی محیط جدا شده ، از جمله DMA دسترسی داشته باشد ، مسدود کند. پروژه منبع باز اندرویدی بالادست (AOSP) با استفاده از اجرای قابل اعتماد ، این نیاز را برآورده می کند ، اما یک راه حل مبتنی بر ARM TrustZone یا یک شخص ثالث اجرای ایمن یک جداسازی مناسب مبتنی بر Hypervisor گزینه های جایگزین است.
• [ 9.11 /H-0-4] باید احراز هویت صفحه قفل را در محیط اجرای جدا شده انجام داده و فقط در صورت موفقیت ، از کلیدهای محدود به تأیید اعتبار استفاده کنید. اعتبارنامه صفحه قفل باید به گونه ای ذخیره شود که فقط به محیط اجرای جدا شده اجازه می دهد تا احراز هویت صفحه قفل را انجام دهد. پروژه منبع باز اندرویدی بالادست ، لایه انتزاع سخت افزار Gatekeeper (HAL) و قابل اعتماد را فراهم می کند که می تواند برای برآورده کردن این نیاز استفاده شود.
• [ 9.11 /H-0-5] باید از تأیید کلید پشتیبانی کند که کلید امضاء تأیید شده توسط سخت افزار ایمن محافظت می شود و امضای آن در سخت افزار ایمن انجام می شود. کلیدهای امضای تأیید باید در تعداد کافی از دستگاه ها به اشتراک گذاشته شوند تا از استفاده کلیدها به عنوان شناسه دستگاه جلوگیری شود. یکی از راه های تأمین این شرط ، به اشتراک گذاشتن همان کلید تأیید است ، مگر اینکه حداقل 100000 واحد از یک SKU معین تولید شود. اگر بیش از 100000 واحد SKU تولید شود ، ممکن است برای هر 100000 واحد از یک کلید متفاوت استفاده شود.
• [9/H-0-1] باید ویژگی "android.hardware.security.model.compative" را اعلام کند.

توجه داشته باشید که اگر اجرای دستگاه در حال حاضر بر روی نسخه قبلی Android راه اندازی شده باشد ، چنین دستگاهی از الزام داشتن یک کلیدی پشتیبانی شده توسط یک محیط اجرای جدا شده معاف است و از تأیید کلید پشتیبانی می کند ، مگر اینکه ویژگی android.hardware.fingerprint را اعلام کند که کدام یک از ویژگی های Android. نیاز به یک کلبه کلیدی دارد که توسط یک محیط اعدام منزوی پشتیبانی می شود.

هنگامی که پیاده سازی دستگاه های دستی از صفحه قفل ایمن پشتیبانی می کند ، آنها:

• [ 9.11 /H-1-1] باید به کاربر اجازه دهد کوتاهترین زمان خواب را انتخاب کند ، یعنی زمان انتقال از قفل به حالت قفل شده ، به عنوان 15 ثانیه یا کمتر.
• [ 9.11 /H-1-2] باید برای مخفی کردن اعلان ها و غیرفعال کردن کلیه اشکال تأیید اعتبار ، به جز احراز هویت اصلی که در صفحه قفل امن 9.11.1 شرح داده شده است ، هزینه کاربر را فراهم کند. AOSP با نیاز به عنوان حالت قفل مطابقت دارد.

اگر پیاده سازی دستگاه های دستی شامل چندین کاربر باشد و پرچم ویژگی android.hardware.telephony را اعلام نکنید ، آنها:

• [ 9.5 /H-2-1] باید از پروفایل های محدود پشتیبانی کند ، ویژگی ای که به صاحبان دستگاه اجازه می دهد کاربران اضافی و قابلیت های آنها را در دستگاه مدیریت کنند. با پروفایل های محدود ، صاحبان دستگاه می توانند به سرعت محیط های جداگانه ای را برای کاربران اضافی تنظیم کنند ، با این امکان که بتوانند محدودیت های ریز ریز در برنامه هایی را که در آن محیط ها موجود است ، مدیریت کنند.

اگر پیاده سازی دستگاه های دستی شامل چندین کاربر باشد و پرچم ویژگی android.hardware.telephony را اعلام کنید ، آنها:

• [ 9.5 /H-3-1] نباید از پروفایل های محدود پشتیبانی کند بلکه باید با اجرای AOSP کنترل ها هماهنگ باشد تا سایر کاربران را از دسترسی به تماس های صوتی و پیام کوتاه فعال یا غیرفعال کند.

Android ، از طریق سیستم API VoiceInteractionService از مکانیسمی برای تشخیص ایمن همیشه در مورد Hot-Word بدون نشانه دسترسی MIC پشتیبانی می کند

اگر پیاده سازی دستگاه های دستی از سیستم API HotwordDetectionService یا مکانیسم دیگری برای تشخیص هات کلمه بدون نشانه دسترسی به MIC پشتیبانی کند ، آنها:

• [9.8/H-1-1] باید اطمینان حاصل کنید که سرویس تشخیص کلمه Hot-Word فقط می تواند داده ها را به سیستم یا ContentCaptureservice منتقل کند
• [9.8/H-1-2] باید اطمینان حاصل کنید که سرویس تشخیص کلمه Hot-Word فقط می تواند داده های صوتی MIC یا داده های حاصل از آن را از طریق API HotwordDetectionService به سرور سیستم منتقل کند ، یا از طریق ContentCaptureManager API ContentCaptureManager را به ContentCaptureService منتقل کند.
• [9.8/H-1-3] نباید صوتی MIC را که بیش از 30 ثانیه برای درخواست شخصی برای تغییر سخت افزار به سرویس تشخیص کلمه Hotword است ، عرضه کند.
• [9.8/H-1-4] برای درخواست فردی به سرویس تشخیص Word Hot-Word نباید MIC بافر قدیمی تر از 8 ثانیه را تأمین کند.
• [9.8/H-1-5] نباید MIC بافر را از 30 ثانیه مسن تر از 30 ثانیه به سرویس تعامل صوتی یا نهاد مشابه عرضه کند.
• [9.8/H-1-6] نباید اجازه دهد بیش از 100 بایت از داده های غیر Audio از سرویس تشخیص Word Word در هر نتیجه موفقیت آمیز Hot-Word منتقل شود.
• [9.8/H-1-7] نباید اجازه دهد بیش از 5 بیت داده از سرویس تشخیص کلمه هات در هر نتیجه منفی کلمه منفی منتقل شود.
• [9.8/H-1-8] فقط باید انتقال داده ها را از سرویس تشخیص HotWord در درخواست اعتبار سنجی HotWord از سرور سیستم فراهم کند.
• [9.8/H-1-9] نباید به یک برنامه قابل نصب کاربر اجازه دهد تا سرویس تشخیص کلمه HotWord را ارائه دهد.
• [9.8/H-1-10] نباید در داده های کمی در مورد استفاده از میکروفون توسط سرویس تشخیص کلمه Hot-Word ، سطح داده شود.
• [9.8/H-1-11] باید تعداد بایت های موجود در هر انتقال را از سرویس تشخیص HotWord وارد کند تا امکان بازرسی برای محققان امنیتی فراهم شود.
• [9.8/H-1-12] باید از یک حالت اشکال زدایی پشتیبانی کند که محتویات خام هر انتقال را از سرویس تشخیص کلمه هات وارد کند تا امکان بازرسی برای محققان امنیتی را فراهم کند.
• [9.8/H-1-14] باید همانطور که در بخش 9.8.2 توضیح داده شده است ، هنگامی که یک نتیجه کلمه کلمه ای موفق به سرویس تعامل صوتی یا نهاد مشابه منتقل می شود ، نشانگر میکروفون را نشان دهد.
• [9.8/H-SR-1] به شدت توصیه می شود قبل از تنظیم برنامه به عنوان ارائه دهنده سرویس تشخیص HotWord ، به کاربران اطلاع دهید.
• [9.8/H-SR-2] به شدت توصیه می شود که از انتقال داده های بدون ساختار خارج از سرویس تشخیص کلمه Hot-Word استفاده کنید.
• [9.8/H-SR-3] به شدت توصیه می شود که حداقل یک بار در هر ساعت یا هر 30 رویداد سخت افزاری ، هر کدام از اولین بار ، هر کدام از اولین بار ، مراحل میزبانی سرویس تشخیص Hot-Word را مجدداً راه اندازی کنید.

اگر پیاده سازی دستگاه شامل برنامه ای است که از سیستم API HotwordDetectionService یا مکانیسم مشابه برای تشخیص هات کلمه بدون نشانه استفاده از MIC استفاده می کند ، برنامه:

• [9.8/H-2-1] باید برای هر عبارت hotword پشتیبانی شده ، اخطار صریح را به کاربر ارائه دهد.
• [9.8/H-2-2] نباید داده های صوتی خام یا داده های حاصل از آن را از طریق سرویس تشخیص کلمه Hot-Word حفظ کند.
• [9.8/H-2-3] نباید از سرویس تشخیص Word Word ، داده های صوتی ، داده هایی که می توان برای بازسازی (کاملاً یا جزئی) استفاده کرد ، یا محتوای صوتی غیر مرتبط با خود Hot-Word ، به جز ContentCaptureService ، منتقل شود.

اگر پیاده سازی دستگاه های دستی android.hardware.microphone اعلام کنید ، آنها:

• [ 9.8.2 /h-4-1] باید هنگام دسترسی به داده های صوتی از میکروفون ، نشانگر میکروفون را نمایش دهد ، اما نه وقتی میکروفون فقط توسط HotwordDetectionService ، SOURCE_HOTWORD ، ContentCaptureService یا برنامه هایی که نقش های نامیده شده در بخش را دارند ، قابل دسترسی است. 9.1 با شناسه CDD [C-4-X].
• [ 9.8.2 /H-4-2] باید لیست برنامه های اخیر و فعال را با استفاده از میکروفون به عنوان بازگشت از PermissionManager.getIndicatorAppOpUsageData() به همراه هر پیام انتساب مرتبط با آنها نمایش دهد.

اگر پیاده سازی دستگاه های دستی android.hardware.camera.any را اعلام کنید ، آنها:

• [ 9.8.2 /H-5-1] باید هنگام دسترسی به داده های دوربین زنده ، نشانگر دوربین را نمایش دهد ، اما نه وقتی دوربین فقط توسط برنامه (ها) که نقش های نامیده شده در بخش 9.1 را با شناسه CDD به دست می آورد ، دسترسی پیدا می کند. [C-4-X].
• [ 9.8.2 /H-5-2] باید برنامه های اخیر و فعال را با استفاده از دوربین به عنوان بازگشت از PermissionManager.getIndicatorAppOpUsageData() ، به همراه هر پیام انتساب مرتبط با آنها نمایش دهد.

2.2.6. ابزارهای توسعه دهنده و سازگاری گزینه ها

پیاده سازی دستگاه های دستی (* برای رایانه لوحی قابل اجرا نیست):

• [ 6.1 /H-0-1]* باید از فرمان پوسته cmd testharness پشتیبانی کند.

پیاده سازی دستگاه های دستی (* برای رایانه لوحی قابل اجرا نیست):

• پرفتو
  • [ 6.1 /H-0-2]* باید باینری A /system/bin/perfetto را در معرض کاربر پوسته قرار دهید که Cmdline با مستندات Perfetto مطابقت دارد.
  • [ 6.1 /H-0-3]* باینری Perfetto باید به عنوان ورودی یک پیکربندی ProtoBUF که مطابق با طرحواره تعریف شده در مستندات Perfetto است ، بپذیرد.
  • [ 6.1 /H-0-4]* باینری Perfetto باید به عنوان خروجی یک ردیابی Protobuf بنویسد که مطابق با طرحواره تعریف شده در مستندات Perfetto است .
  • [ 6.1 /H-0-5]* باید حداقل از طریق باینری Perfetto ، حداقل منابع داده شرح داده شده در مستندات Perfetto را فراهم کند.
  • [ 6.1 /H-0-6]* Daemon Treced Perfetto باید به طور پیش فرض فعال شود (خاصیت سیستم persist.traced.enable ).

2.2.7. کلاس عملکرد رسانه ای دستی

برای تعریف کلاس عملکرد رسانه به بخش 7.11 مراجعه کنید.

2.2.7.1. رسانه ها

اگر پیاده سازی دستگاه های دستی android.os.Build.VERSION_CODES.S را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• باید نیازهای رسانه ای ذکر شده در Android 12 CDD بخش 2.2.7.1 را برآورده کند.

در صورت اجرای دستگاه دستی ، android.os.Build.VERSION_CODES.T را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• [5.1/H-1-1] باید حداکثر تعداد جلسات رمزگشایی ویدیویی سخت افزاری را که می تواند همزمان در هر ترکیب کدک از طریق CodecCapabilities.getMaxSupportedInstances() انجام شود VideoCapabilities.getSupportedPerformancePoints() تبلیغ کنید.
• [5.1/H-1-2] باید از 6 نمونه از جلسات رمزگشایی ویدیویی سخت افزاری (AVC ، HEVC ، VP9 ، AV1 یا بعد از آن) در هر ترکیب کدک که همزمان با وضوح 1080p@30 فریم در ثانیه اجرا می شود ، پشتیبانی کند.
• [5.1/H-1-3] باید حداکثر تعداد جلسات رمزگذار ویدیویی سخت افزاری را که می تواند همزمان در هر ترکیب کدک از طریق CodecCapabilities.getMaxSupportedInstances() انجام شود VideoCapabilities.getSupportedPerformancePoints() تبلیغ کنید.
• [5.1/H-1-4] باید از 6 نمونه از جلسات رمزگذار ویدیویی سخت افزاری (AVC ، HEVC ، VP9 ، AV1 یا بعد) در هر ترکیب کدک که همزمان با وضوح 1080p@30fps اجرا می شود ، پشتیبانی کند.
• [5.1/H-1-5] باید حداکثر تعداد رمزگذار ویدیوی سخت افزاری و جلسات رمزگشایی را که می تواند همزمان در هر ترکیب کدک از طریق CodecCapabilities.getMaxSupportedInstances() انجام شود VideoCapabilities.getSupportedPerformancePoints() تبلیغ کنید.
• [5.1/H-1-6] باید از 6 نمونه از رمزگذار ویدیوی سخت افزاری و جلسات رمزگذار ویدیویی سخت افزاری (AVC ، HEVC ، VP9 ، AV1 یا بعد از آن) در هر ترکیب کدک که به طور همزمان در وضوح 1080p@30fps اجرا می شود ، پشتیبانی کند.
• [5.1/H-1-7] باید برای یک جلسه رمزگذاری ویدیویی 1080p یا کوچکتر برای همه رمزگذارهای ویدیویی سخت افزاری در هنگام بارگذاری ، تأخیر اولیه کدک یا کمتر داشته باشد. بار در اینجا به عنوان یک جلسه رمزگذاری ویدیویی فقط 1080p تا 720p با استفاده از کدک های ویدیویی سخت افزاری به همراه اولیه ضبط ضبط صوتی 1080p تعریف شده است. برای کدک Dolby Vision ، تأخیر اولیه سازی کدک باید 50 میلی ثانیه یا کمتر باشد.
• [5.1/H-1-8] باید برای یک جلسه رمزگذاری صوتی 128 کیلوبیت در ثانیه یا کمتر از جلسه رمزگذاری صوتی BITRATE برای همه رمزگذارهای صوتی در هنگام بار ، یک تأخیر اولیه کدک داشته باشد. بار در اینجا به عنوان یک جلسه رمزگذاری ویدیویی فقط 1080p تا 720p با استفاده از کدک های ویدیویی سخت افزاری به همراه اولیه ضبط ضبط صوتی 1080p تعریف شده است.
• [5.1/H-1-9] باید از 2 نمونه از جلسات رمزگشایی ویدیوی سخت افزاری ایمن (AVC ، HEVC ، VP9 ، AV1 یا بعد از آن) در هر ترکیب کدک که به طور همزمان با وضوح 1080p@30 فریم در ثانیه اجرا می شود ، پشتیبانی کند.
• [5.1/H-1-10] باید از 3 نمونه از جلسات رمزگشایی ویدیوی سخت افزاری غیر ایمن به همراه 1 نمونه جلسه رمزگشایی ویدیوی سخت افزاری ایمن (4 مورد در کل) (AVC ، HEVC ، VP9 ، AV1 یا بعد) در هر کدک پشتیبانی کند. ترکیبی که همزمان با وضوح 1080p@30fps اجرا می شود.
• [5.1/ H-1-11] باید از رمزگشایی ایمن برای هر رمزگذار سخت افزاری AVC ، HEVC ، VP9 یا AV1 در دستگاه پشتیبانی کند.
• [5.1/H-1-12] باید برای یک جلسه رمزگشایی ویدیویی 1080p یا کوچکتر برای همه رمزگشاهای ویدیویی سخت افزاری در زمان بارگذاری ، یک تأخیر اولیه کدک 40 میلی ثانیه یا کمتر داشته باشد. بار در اینجا به عنوان یک جلسه رمزگذاری ویدیویی فقط 1080p تا 720p با استفاده از کدک های ویدیویی سخت افزاری به همراه اولیه سازی پخش صوتی و تصویری 1080p تعریف شده است. برای کدک Dolby Vision ، تأخیر اولیه سازی کدک باید 50 میلی ثانیه یا کمتر باشد.
• [5.1/H-1-13] باید برای یک جلسه رمزگشایی صوتی 128 کیلوبیت در ثانیه یا پایین تر برای همه رمزگشایی های صوتی در هنگام بار ، یک تأخیر اولیه کدک 30 میلی ثانیه یا کمتر داشته باشد. بار در اینجا به عنوان یک جلسه رمزگذاری ویدیویی فقط 1080p تا 720p با استفاده از کدک های ویدیویی سخت افزاری به همراه اولیه سازی پخش صوتی و تصویری 1080p تعریف شده است.
• [5.1/H-1-14] باید از Decoder سخت افزار AV1 Main 10 ، سطح 4.1 پشتیبانی کند.
• [5.1/H-SR-1] به شدت توصیه می شود که از دانه فیلم برای رمزگشایی سخت افزار AV1 پشتیبانی کنید.
• [5.1/H-1-15] باید حداقل 1 رمزگشایی ویدیویی سخت افزاری را که از 4K60 پشتیبانی می کند ، داشته باشد.
• [5.1/H-1-16] باید حداقل 1 رمزگذار ویدیویی سخت افزاری را که از 4K60 پشتیبانی می کند ، داشته باشد.
• [5.3/H-1-1] برای یک جلسه ویدیویی 1080p 60 فریم در ثانیه تحت بار نباید بیش از 1 فریم را در 10 ثانیه کاهش دهد. بار به عنوان یک جلسه رمزگذاری ویدیویی فقط 1080p تا 720p با استفاده از کدک های ویدیویی سخت افزاری و همچنین پخش صوتی AAC 128 Kbps تعریف می شود.
• [5.3/H-1-2] در طی یک وضوح تصویری در یک جلسه ویدیویی 60 فریم در ثانیه تحت بار ، نباید بیش از 1 قاب در 10 ثانیه کاهش یابد. بار به عنوان یک جلسه رمزگذاری ویدیویی فقط 1080p تا 720p با استفاده از کدک های ویدیویی سخت افزاری و همچنین پخش صوتی AAC 128 Kbps تعریف می شود.
• [5.6/H-1-1] باید با استفاده از تست TAP-TONE OBOETESTER یا تست تأیید کننده CTS TONE ، از 80 میلی ثانیه یا کمتر از 80 میلی ثانیه برخوردار باشد.
• [5.6/H-1-2] باید حداقل یک مسیر داده پشتیبانی شده از 80 میلی ثانیه یا کمتر از یک مسیر صوتی دور باشد.
• [5.6/H-1-3] باید از> = 24 بیتی صوتی برای خروجی استریو بیش از 3.5 میلی متر جک های صوتی در صورت وجود و بیش از صدای USB پشتیبانی کند ، در صورت پشتیبانی از کل مسیر داده برای تأخیر کم و تنظیمات جریان. برای پیکربندی تأخیر کم ، AUADIO باید توسط برنامه در حالت پاسخ به تماس کم تأخیر استفاده شود. برای پیکربندی جریان ، باید از Audiotrack Java توسط برنامه استفاده شود. در هر دو تنظیمات تأخیر و پخش جریان ، سینک خروجی HAL باید AUDIO_FORMAT_PCM_24_BIT ، AUDIO_FORMAT_PCM_24_BIT_PACKED ، AUDIO_FORMAT_PCM_32_BIT یا AUDIO_FORMAT_PCM_FLOAT برای قالب خروجی هدف خود بپذیرد.
• [5.6/H-1-4] باید پشتیبانی کند> = 4 دستگاه صوتی USB USB (این توسط کنترل کننده های DJ برای پیش نمایش آهنگ استفاده می شود.)
• [5.6/H-1-5] باید از دستگاه های MIDI سازگار با کلاس پشتیبانی کند و پرچم ویژگی MIDI را اعلام کند.
• [5.7/H-1-2] باید با قابلیت رمزگشایی محتوای زیر از MediaDrm.SECURITY_LEVEL_HW_SECURE_ALL پشتیبانی کند.

2.2.7.2. دوربین

اگر پیاده سازی دستگاه های دستی android.os.Build.VERSION_CODES.S را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• باید نیازهای دوربین ذکر شده در Android 12 CDD بخش 2.2.7.2 را برآورده کند.

در صورت اجرای دستگاه دستی ، android.os.Build.VERSION_CODES.T را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• [7.5/H-1-1] باید یک دوربین عقب اصلی با وضوح حداقل 12 مگاپیکسلی که از ضبط فیلم در 4K@30fps پشتیبانی می کند ، داشته باشد. دوربین اصلی عقب دوربین عقب با کمترین شناسه دوربین است.
• [7.5/H-1-2] باید یک دوربین جلوی اصلی با وضوح حداقل 5 مگاپیکسلی داشته و از ضبط فیلمبرداری در 1080p@30fps پشتیبانی کند. دوربین جلوی اصلی دوربین جلویی با کمترین شناسه دوربین است.
• [7.5/H-1-3] باید از ویژگی های android.info.supportedHardwareLevel به عنوان FULL یا بهتر برای پشتی اولیه و LIMITED یا بهتر برای دوربین اصلی جلو پشتیبانی کند.
• [7.5/H-1-4] باید از CameraMetadata.SENSOR_INFO_TIMESTAMP_SOURCE_REALTIME برای هر دو دوربین اصلی پشتیبانی کند.
• [7.5/H-1-5] باید Camera2 JPEG Capture Latency <1000 ms را برای وضوح 1080p داشته باشد ، همانطور که توسط دوربین CTS در شرایط روشنایی (3000K) برای هر دو دوربین اصلی اندازه گیری می شود.
• [7.5/H-1-6] باید دارای تاخیر راه اندازی Camera2 (دوربین باز برای اولین قاب پیش نمایش) <500 ms باشد که توسط CTS Camera Performancetest تحت شرایط روشنایی (3000K) برای هر دو دوربین اصلی اندازه گیری می شود.
• [7.5/H-1-8] باید از CameraMetadata.REQUEST_AVAILABLE_CAPABILITIES_RAW و android.graphics.ImageFormat.RAW_SENSOR برای دوربین اصلی پشت پشتیبانی کند.
• [7.5/H-1-9] باید یک دوربین اصلی پشتی داشته باشد که از 720p یا 1080p @ 240fps پشتیبانی می کند.
• [7.5/H-1-10] در صورت وجود دوربین RGB Ultrawide با همان جهت ، باید از Min Zoom_Ratio <1.0 برای دوربین های اولیه استفاده کند.
• [7.5/H-1-11] باید جریان پشتی همزمان را روی دوربین های اولیه اجرا کند.
• [7.5/H-1-12] باید از CONTROL_VIDEO_STABILIZATION_MODE_PREVIEW_STABILIZATION برای دوربین پشتی اصلی پشتیبانی کند.
• [7.5/H-1-13] در صورت وجود بیش از 1 دوربین پشتی RGB ، باید از قابلیت LOGICAL_MULTI_CAMERA برای دوربین اصلی عقب پشتیبانی کند.
• [7.5/H-1-14] باید از قابلیت STREAM_USE_CASE برای دوربین پشتی اصلی و اصلی پشتی پشتیبانی کند.

2.2.7.3. سخت افزار

اگر پیاده سازی دستگاه های دستی android.os.Build.VERSION_CODES.S را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• باید نیازهای سخت افزاری ذکر شده در Android 12 CDD بخش 2.2.7.3 را برآورده کند.

در صورت اجرای دستگاه دستی ، android.os.Build.VERSION_CODES.T را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• [7.1.1.1/H-2-1] باید وضوح صفحه حداقل 1080p داشته باشد.
• [7.1.1.3/H-2-1] باید چگالی صفحه حداقل 400 dpi داشته باشد.
• [7.6.1/H-2-1] باید حداقل 8 گیگابایت حافظه فیزیکی داشته باشد.

2.2.7.4. عملکرد

اگر پیاده سازی دستگاه های دستی android.os.Build.VERSION_CODES.S را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• باید نیازهای عملکرد ذکر شده در Android 12 CDD بخش 2.2.7.4 را برآورده کند.

در صورت اجرای دستگاه دستی ، android.os.Build.VERSION_CODES.T را برای android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS برگردانید ، پس آنها:

• [8.2/H-1-1] باید عملکرد نوشتن متوالی حداقل 125 مگابایت در ثانیه را تضمین کند.
• [8.2/H-1-2] باید عملکرد نوشتن تصادفی حداقل 10 مگابایت در ثانیه را تضمین کند.
• [8.2/H-1-3] باید عملکرد خواندن متوالی حداقل 250 مگابایت در ثانیه را تضمین کند.
• [8.2/H-1-4] باید عملکرد خواندن تصادفی حداقل 40 مگابایت در ثانیه را تضمین کند.

2.3. الزامات تلویزیونی

یک دستگاه تلویزیونی Android به اجرای دستگاه Android اشاره دارد که یک رابط سرگرمی برای مصرف رسانه های دیجیتال ، فیلم ها ، بازی ها ، برنامه ها و/یا تلویزیون زنده برای کاربرانی است که در حدود ده فوت دورتر نشسته اند (یک کاربر "لاغر" یا "کاربر 10 پا رابط ").

در صورت رعایت همه معیارهای زیر ، پیاده سازی دستگاه های Android به عنوان یک تلویزیون طبقه بندی می شوند:

• مکانیسمی را برای کنترل از راه دور رابط کاربری ارائه شده بر روی صفحه نمایش فراهم کرده اند که ممکن است ده پا از کاربر دور باشد.
• یک صفحه نمایش صفحه نمایش تعبیه شده با طول مورب بزرگتر از 24 اینچ داشته باشید یا شامل یک درگاه خروجی ویدیویی مانند VGA ، HDMI ، DisplayPort یا یک درگاه بی سیم برای صفحه نمایش باشید.

الزامات اضافی در بقیه این بخش مخصوص پیاده سازی دستگاه های تلویزیون اندرویدی است.

2.3.1. سخت افزار

پیاده سازی دستگاه های تلویزیونی:

• [ 7.2 .2/T-0-1] باید از D-Pad پشتیبانی کند.
• [ 7.2 .3/T-0-1] باید توابع خانه و پشت را ارائه دهد.
• [ 7.2 .3/t-0-2] باید هر دو رویداد فشار عادی و طولانی عملکرد پشتی ( KEYCODE_BACK ) را به برنامه پیش زمینه ارسال کنید.
• [ 7.2 .6.1/T-0-1] باید پشتیبانی از کنترل کننده های بازی را شامل شود و پرچم ویژگی android.hardware.gamepad را اعلام کنید.
• [ 7.2 .7/t] باید یک کنترل از راه دور را فراهم کند که کاربران بتوانند به ورودی های کلیدهای ناوبری غیر لمسی و کلیدهای ناوبری دسترسی پیدا کنند.

اگر پیاده سازی دستگاه های تلویزیونی شامل ژیروسکوپ 3 محوره باشد ، آنها:

• [ 7.3 .4/t-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش دهد.
• [ 7.3 .4/t-1-2] باید قادر به اندازه گیری تغییرات جهت گیری تا 1000 درجه در ثانیه باشد.

پیاده سازی دستگاه های تلویزیونی:

• [ 7.4 .3/T-0-1] باید از بلوتوث و بلوتوث LE پشتیبانی کند.
• [ 7.6 .1/T-0-1] باید حداقل 4 گیگابایت ذخیره غیر فرار برای برنامه های خصوصی برنامه (با نام "/داده" پارتیشن) داشته باشد.

اگر پیاده سازی دستگاه های تلویزیونی شامل یک درگاه USB است که از حالت میزبان پشتیبانی می کند ، آنها:

• [ 7.5 .3/t-1-1] باید شامل پشتیبانی از یک دوربین خارجی باشد که از طریق این درگاه USB متصل می شود اما لزوماً همیشه به هم وصل نمی شود.

اگر پیاده سازی دستگاه های تلویزیونی 32 بیتی باشد:

• [ 7.6 .1/t-1-1] حافظه موجود در هسته و فضای کاربری باید حداقل 896 مگابایت باشد در صورت استفاده از چگالی های زیر:

  • 400DPI یا بالاتر در صفحه های کوچک/عادی
  • XHDPI یا بالاتر در صفحه های بزرگ
  • TVDPI یا بالاتر در صفحه های فوق العاده بزرگ

اگر پیاده سازی دستگاه های تلویزیونی 64 بیتی باشد:

• [ 7.6 .1/T-2-1] حافظه موجود در هسته و فضای کاربری باید حداقل در صورت استفاده از چگالی زیر 1280 مگابایت باشد:

  • 400DPI یا بالاتر در صفحه های کوچک/عادی
  • XHDPI یا بالاتر در صفحه های بزرگ
  • TVDPI یا بالاتر در صفحه های فوق العاده بزرگ

توجه داشته باشید که "حافظه در دسترس برای هسته و فضای کاربری" در بالا به فضای حافظه ارائه شده علاوه بر هر حافظه ای که قبلاً به اجزای سخت افزاری مانند رادیو ، فیلم و موارد دیگر اختصاص داده شده است ، اشاره دارد.

پیاده سازی دستگاه های تلویزیونی:

• [ 7.8 .1/t] باید شامل میکروفون باشد.
• [ 7.8 .2/t-0-1] باید یک خروجی صوتی داشته باشد و android.hardware.audio.output را اعلام کند.

2.3.2. چند رسانه ای

اجرای دستگاه های تلویزیونی باید از قالب های رمزگذاری و رمزگشایی صوتی زیر پشتیبانی کند و آنها را در دسترس برنامه های شخص ثالث قرار دهد:

• [ 5.1 /T-0-1] پروفایل MPEG-4 AAC (AAC LC)
• [ 5.1 /T-0-2] مشخصات MPEG-4 HE AAC (AAC+)
• [ 5.1 /T-0-3] AAC ELD (افزایش تأخیر کم AAC)

پیاده سازی دستگاه های تلویزیونی باید از قالب های رمزگذاری ویدیویی زیر پشتیبانی کند و آنها را در دسترس برنامه های شخص ثالث قرار دهد:

• [ 5.2 /T-0-1] H.264
• [ 5.2 /T-0-2] VP8

پیاده سازی دستگاه های تلویزیونی:

• [ 5.2 .2/T-SR-1] به شدت توصیه می شود که از رمزگذاری H.264 فیلم های وضوح 720p و 1080p در 30 فریم در ثانیه پشتیبانی کنید.

پیاده سازی دستگاه های تلویزیونی باید از قالب های رمزگشایی ویدیویی زیر پشتیبانی کند و آنها را در دسترس برنامه های شخص ثالث قرار دهد:

• [ 5.3.3 /T-0-1] MPEG-4 SP
• [ 5.3.4 /T-0-2] H.264 AVC
• [ 5.3.5 /t-0-3] H.265 HEVC
• [ 5.3.6 /T-0-4] VP8
• [ 5.3.7 /T-0-5] VP9
• [ 5.3.1 /T-0-6] MPEG-2

پیاده سازی دستگاه های تلویزیونی باید از رمزگشایی MPEG-2 پشتیبانی کند ، همانطور که در بخش 5.3.1 به تفصیل در نرخ و قطعنامه های استاندارد فریم و ویدیویی تا و از جمله:

• [ 5.3.1 /t-1-1] HD 1080p در 29.97 فریم در ثانیه با سطح بالایی مشخصات اصلی.
• [ 5.3.1 /T-1-2] HD 1080I در 59.94 فریم در ثانیه با سطح بالایی مشخصات اصلی. آنها باید ویدیوی MPEG-2 را به هم متصل کنند و آن را در دسترس برنامه های شخص ثالث قرار دهند.

پیاده سازی دستگاه های تلویزیونی باید از رمزگشایی H.264 پشتیبانی کند ، همانطور که در بخش 5.3.4 به تفصیل در نرخ و وضوح وضوح ویدیویی استاندارد تا و از جمله:

• [ 5.3.4 /t-1-1] HD 1080p در 60 فریم در ثانیه با مشخصات پایه
• [ 5.3.4 /t-1-2] HD 1080p در 60 فریم در ثانیه با مشخصات اصلی
• [ 5.3.4 /t-1-3] HD 1080p در 60 فریم در ثانیه با سطح بالاترین سطح 4.2

پیاده سازی دستگاه های تلویزیونی با رمزگشاهای سخت افزاری H.265 باید از رمزگشایی H.265 پشتیبانی کند ، همانطور که در بخش 5.3.5 به تفصیل در نرخ و وضوح ویدیویی استاندارد تا و از جمله:

• [ 5.3.5 /t-1-1] HD 1080p در 60 فریم در ثانیه با سطح مشخصات اصلی 4.1

اگر پیاده سازی دستگاه های تلویزیونی با رمزگشاهای سخت افزاری H.265 از رمزگشایی H.265 و مشخصات رمزگشایی UHD پشتیبانی می کند ، آنها:

• [ 5.3.5 /t-2-1] باید از مشخصات رمزگشایی UHD در 60 فریم در ثانیه با مشخصات اصلی سطح 5 Main10 پشتیبانی کند

پیاده سازی دستگاه های تلویزیونی باید از رمزگشایی VP8 پشتیبانی کند ، همانطور که در بخش 5.3.6 به تفصیل در نرخ و وضوح ویدیویی استاندارد تا و از جمله موارد زیر آمده است:

• [ 5.3.6 /t-1-1] HD 1080p در 60 فریم در مشخصات رمزگشایی دوم

پیاده سازی دستگاه های تلویزیونی با رمزگشاهای سخت افزاری VP9 باید از رمزگشایی VP9 پشتیبانی کند ، همانطور که در بخش 5.3.7 به تفصیل در نرخ و وضوح استاندارد فریم و ویدیویی تا و از جمله:

• [ 5.3.7 /t-1-1] HD 1080p در 60 فریم در ثانیه با مشخصات 0 (عمق رنگ 8 بیتی)

اگر پیاده سازی دستگاه های تلویزیونی با رمزگشاهای سخت افزار VP9 از رمزگشایی VP9 و مشخصات رمزگشایی UHD پشتیبانی می کند ، آنها:

• [ 5.3.7 /T-2-1] باید از مشخصات رمزگشایی UHD در 60 فریم در ثانیه با مشخصات 0 (عمق رنگ 8 بیتی) پشتیبانی کند.
• [ 5.3.7 /T-SR1] به شدت توصیه می شود تا از مشخصات رمزگشایی UHD در 60 فریم در ثانیه با مشخصات 2 (عمق رنگ 10 بیتی) پشتیبانی کنید.

پیاده سازی دستگاه های تلویزیونی:

• [ 5.5 /T-0-1] باید شامل پشتیبانی از حجم استاد سیستم و ضعف حجم صدا دیجیتال بر روی خروجی های پشتیبانی شده باشد ، به جز خروجی فشار صوتی فشرده شده (جایی که هیچ رمزگشایی صوتی روی دستگاه انجام نمی شود).

اگر پیاده سازی دستگاه های تلویزیونی دارای نمایشگر در صفحه نمایش نیست ، اما در عوض از یک صفحه نمایش خارجی که از طریق HDMI متصل است ، پشتیبانی می کنند ، آنها:

• [ 5.8 /T-0-1] باید حالت خروجی HDMI را تنظیم کند تا حداکثر وضوح را که می تواند با نرخ تازه سازی 50Hz یا 60Hz پشتیبانی کند ، انتخاب کند.
• [ 5.8 /T-SR-1] به شدت توصیه می شود که یک انتخاب کننده نرخ تازه سازی HDMI قابل تنظیم کاربر را ارائه دهید.
• [ 5.8 ] بسته به میزان تازه کردن ویدیو برای منطقه ای که دستگاه در آن فروخته می شود ، باید نرخ تازه کردن حالت خروجی HDMI را روی 50Hz یا 60Hz تنظیم کنید.

اگر پیاده سازی دستگاه های تلویزیونی دارای نمایشگر در صفحه نمایش نیست ، اما در عوض از یک صفحه نمایش خارجی که از طریق HDMI متصل است ، پشتیبانی می کنند ، آنها:

• [ 5.8 /T-1-1] باید از HDCP 2.2 پشتیبانی کند.

اگر پیاده سازی دستگاه های تلویزیونی از رمزگشایی UHD پشتیبانی نمی کنند ، بلکه در عوض از یک صفحه نمایش خارجی که از طریق HDMI متصل است پشتیبانی می کنند ، آنها:

• [ 5.8 /T-2-1] باید از HDCP 1.4 پشتیبانی کند

2.3.3. نرم افزار

پیاده سازی دستگاه های تلویزیونی:

• [ 3 /T-0-1] باید ویژگی های android.software.leanback و android.hardware.type.television را اعلام کند.
• [ 3.2.3.1 /T-0-1] باید یک یا چند برنامه یا مؤلفه های خدمات را با یک کنترل کننده قصد بارگذاری کنید ، برای کلیه الگوهای فیلتر قصد عمومی که توسط اهداف برنامه زیر ذکر شده در اینجا تعریف شده است.
• [ 3.4 .1/T-0-1] باید یک اجرای کامل android.webkit.Webview API را ارائه دهد.

اگر پیاده سازی دستگاه های تلویزیونی اندرویدی از صفحه قفل پشتیبانی می کند ، آنها:

• [ 3.8 .10/T-1-1] باید اعلان های صفحه قفل از جمله الگوی اعلان رسانه را نمایش دهد.

پیاده سازی دستگاه های تلویزیونی:

• [ 3.8 .14/T-SR-1] به شدت توصیه می شود که از حالت چند پنجره تصویر در تصویر (PIP) پشتیبانی کنید.
• [ 3.10 /T-0-1] باید از خدمات دسترسی به شخص ثالث پشتیبانی کند.
• [ 3.10 /T-SR-1] به شدت توصیه می شود خدمات دسترسی را از پیش بارگیری در دستگاه قابل مقایسه با یا بیش از عملکرد دسترسی به سوئیچ و گفتگوی (برای زبانهای پشتیبانی شده توسط موتور متن به گفتار از پیش نصب شده) ارائه دهید. پروژه منبع باز Talkback .

اگر پیاده سازی دستگاه های تلویزیونی ویژگی android.hardware.audio.output را گزارش کنید ، آنها:

• [ 3.11 /T-SR-1] به شدت توصیه می شود یک موتور TTS را که از زبانهای موجود در دستگاه پشتیبانی می کند ، درج کنید.
• [ 3.11 /T-1-1] باید از نصب موتورهای TTS شخص ثالث پشتیبانی کند.

پیاده سازی دستگاه های تلویزیونی:

• [ 3.12 /T-0-1] باید از چارچوب ورودی تلویزیون پشتیبانی کند.

2.3.4. عملکرد و قدرت

• [ 8.1 /T-0-1] تأخیر قاب ثابت . تأخیر قاب متناقض یا تأخیر در ارائه فریم ها نباید بیشتر از 5 فریم در ثانیه اتفاق بیفتد و در یک ثانیه باید زیر 1 فریم باشد.
• [ 8.2 /T-0-1] باید عملکرد نوشتن متوالی حداقل 5MB /s را تضمین کند.
• [ 8.2 /T-0-2] باید عملکرد نوشتن تصادفی حداقل 0.5 مگابایت در ثانیه را تضمین کند.
• [ 8.2 /T-0-3] باید عملکرد خواندن متوالی حداقل 15MB /s را تضمین کند.
• [ 8.2 /T-0-4] باید عملکرد خواندن تصادفی حداقل 3.5 مگابایت در ثانیه را تضمین کند.

اگر پیاده سازی دستگاه های تلویزیونی شامل ویژگی هایی برای بهبود مدیریت انرژی دستگاه است که در AOSP گنجانده شده یا ویژگی هایی را که در AOSP گنجانده شده است ، گسترش می دهند ، آنها:

• [ 8.3 /t-1-1] برای فعال کردن و غیرفعال کردن ویژگی محافظ باتری باید هزینه کاربر را فراهم کند.

اگر پیاده سازی دستگاه های تلویزیونی باتری نداشته باشد:

• [ 8.3 /t-1-2] باید دستگاه را به عنوان یک دستگاه بدون باتری ثبت کنید ، همانطور که در پشتیبانی از دستگاه های بدون باتری توضیح داده شده است.

اگر پیاده سازی دستگاه های تلویزیونی باتری داشته باشد:

• [ 8.3 /t-1-3] باید هزینه کاربر را برای نمایش کلیه برنامه هایی که از حالت آماده به کار برنامه و حالت های صرفه جویی در مصرف برق استفاده می کنند ، فراهم کند.

پیاده سازی دستگاه های تلویزیونی:

• [ 8.4 /T-0-1] باید یک پروفایل قدرت در هر جزء را ارائه دهد که مقدار مصرف فعلی را برای هر مؤلفه سخت افزاری و تخلیه تقریبی باتری ناشی از قطعات به مرور زمان مشخص می کند ، همانطور که در سایت پروژه منبع باز اندروید ثبت شده است.
• [ 8.4 /T-0-2] باید تمام مقادیر مصرف برق را در ساعات میلی لیتر (MAH) گزارش دهد.
• [ 8.4 /T-0-3] باید مصرف انرژی CPU را در مورد UID هر فرآیند گزارش دهد. پروژه منبع باز اندروید از طریق اجرای ماژول هسته uid_cputime با این نیاز برآورده می شود.
• [ 8.4 /t] در صورت عدم امکان استفاده از انرژی مؤلفه سخت افزاری به یک برنامه ، باید به خود مؤلفه سخت افزار نسبت داده شود.
• [ 8.4 /T-0-4] باید این استفاده از قدرت را از طریق دستور adb shell dumpsys batterystats Shell Dumpsys به توسعه دهنده برنامه در دسترس قرار دهد.

2.3.5. مدل امنیتی

پیاده سازی دستگاه های تلویزیونی:

• [ 9.11 /T-0-1] MUST back up the keystore implementation with an isolated execution environment.
• [ 9.11 /T-0-2] MUST have implementations of RSA, AES, ECDSA and HMAC cryptographic algorithms and MD5, SHA1, and SHA-2 family hash functions to properly support the Android Keystore system's supported algorithms in an area that is securely isolated from the code running on the kernel and above. Secure isolation MUST block all potential mechanisms by which kernel or userspace code might access the internal state of the isolated environment, including DMA. The upstream Android Open Source Project (AOSP) meets this requirement by using the Trusty implementation, but another ARM TrustZone-based solution or a third-party reviewed secure implementation of a proper hypervisor-based isolation are alternative options.
• [ 9.11 /T-0-3] MUST perform the lock screen authentication in the isolated execution environment and only when successful, allow the authentication-bound keys to be used. Lock screen credentials MUST be stored in a way that allows only the isolated execution environment to perform lock screen authentication. The upstream Android Open Source Project provides the Gatekeeper Hardware Abstraction Layer (HAL) and Trusty, which can be used to satisfy this requirement.
• [ 9.11 /T-0-4] MUST support key attestation where the attestation signing key is protected by secure hardware and signing is performed in secure hardware. The attestation signing keys MUST be shared across large enough number of devices to prevent the keys from being used as device identifiers. One way of meeting this requirement is to share the same attestation key unless at least 100,000 units of a given SKU are produced. If more than 100,000 units of an SKU are produced, a different key MAY be used for each 100,000 units.
• [9/T-0-1] MUST declare the 'android.hardware.security.model.compatible' feature.

Note that if a device implementation is already launched on an earlier Android version, such a device is exempted from the requirement to have a keystore backed by an isolated execution environment and support the key attestation, unless it declares the android.hardware.fingerprint feature which requires a keystore backed by an isolated execution environment.

If Television device implementations support a secure lock screen, they:

• [ 9.11 /T-1-1] MUST allow the user to choose the Sleep timeout for transition from the unlocked to the locked state, with a minimum allowable timeout up to 15 seconds or less.

If Television device implementations include multiple users and do not declare the android.hardware.telephony feature flag, they:

• [ 9.5 /T-2-1] MUST support restricted profiles, a feature that allows device owners to manage additional users and their capabilities on the device. With restricted profiles, device owners can quickly set up separate environments for additional users to work in, with the ability to manage finer-grained restrictions in the apps that are available in those environments.

If Television device implementations include multiple users and declare the android.hardware.telephony feature flag, they:

• [ 9.5 /T-3-1] MUST NOT support restricted profiles but MUST align with the AOSP implementation of controls to enable /disable other users from accessing the voice calls and SMS.

If Television device implementations declare android.hardware.microphone , they:

• [ 9.8.2 /T-4-1] MUST display the microphone indicator when an app is accessing audio data from the microphone, but not when the microphone is only accessed by HotwordDetectionService, SOURCE_HOTWORD, ContentCaptureService, or apps holding the roles called out in Section 9.1 Permissions with CDD identifier C-3-X].
• [ 9.8.2 /T-4-2] MUST not hide the microphone indicator for system apps that have visible user interfaces or direct user interaction.

If Television device implementations declare android.hardware.camera.any , they:

• [ 9.8.2 /T-5-1] MUST display the camera indicator when an app is accessing live camera data, but not when the camera is only being accessed by app(s) holding the roles called out in Section 9.1 Permissions with CDD identifier [C-3-X].
• [ 9.8.2 /T-5-2] MUST not hide the camera indicator for system apps that have visible user interfaces or direct user interaction.

2.3.6. Developer Tools and Options Compatibility

Television device implementations:

• پرفتو
  • [ 6.1 /T-0-1] MUST expose a /system/bin/perfetto binary to the shell user which cmdline complies with the perfetto documentation .
  • [ 6.1 /T-0-2] The perfetto binary MUST accept as input a protobuf config that complies with the schema defined in the perfetto documentation .
  • [ 6.1 /T-0-3] The perfetto binary MUST write as output a protobuf trace that complies with the schema defined in the perfetto documentation .
  • [ 6.1 /T-0-4] MUST provide, through the perfetto binary, at least the data sources described in the perfetto documentation .

2.4. الزامات ساعت

An Android Watch device refers to an Android device implementation intended to be worn on the body, perhaps on the wrist.

Android device implementations are classified as a Watch if they meet all the following criteria:

• Have a screen with the physical diagonal length in the range from 1.1 to 2.5 inches.
• Have a mechanism provided to be worn on the body.

The additional requirements in the rest of this section are specific to Android Watch device implementations.

2.4.1. سخت افزار

Watch device implementations:

• [ 7.1 .1.1/W-0-1] MUST have a screen with the physical diagonal size in the range from 1.1 to 2.5 inches.

• [ 7.2 .3/W-0-1] MUST have the Home function available to the user, and the Back function except for when it is in UI_MODE_TYPE_WATCH .

• [ 7.2 .4/W-0-1] MUST support touchscreen input.

• [ 7.3 .1/W-SR-1] Are STRONGLY RECOMMENDED to include a 3-axis accelerometer.

If Watch device implementations include a GPS/GNSS receiver and report the capability to applications through the android.hardware.location.gps feature flag, they:

• [ 7.3 .3/W-1-1] MUST report GNSS measurements, as soon as they are found, even if a location calculated from GPS/GNSS is not yet reported.
• [ 7.3 .3/W-1-2] MUST report GNSS pseudoranges and pseudorange rates, that, in open-sky conditions after determining the location, while stationary or moving with less than 0.2 meter per second squared of acceleration, are sufficient to calculate position within 20 meters, and speed within 0.2 meters per second, at least 95% of the time.

If Watch device implementations include a 3-axis gyroscope, they:

• [ 7.3 .4/W-2-1] MUST be capable of measuring orientation changes up to 1000 degrees per second.

Watch device implementations:

• [ 7.4 .3/W-0-1] MUST support Bluetooth.

• [ 7.6 .1/W-0-1] MUST have at least 1 GB of non-volatile storage available for application private data (aka "/data" partition).

• [ 7.6 .1/W-0-2] MUST have at least 416 MB memory available to the kernel and userspace.

• [ 7.8 .1/W-0-1] MUST include a microphone.

• [ 7.8 .2/W] MAY have audio output.

2.4.2. چند رسانه ای

No additional requirements.

2.4.3. نرم افزار

Watch device implementations:

• [ 3 /W-0-1] MUST declare the feature android.hardware.type.watch .
• [ 3 /W-0-2] MUST support uiMode = UI_MODE_TYPE_WATCH .
• [ 3.2.3.1 /W-0-1] MUST preload one or more applications or service components with an intent handler, for all the public intent filter patterns defined by the following application intents listed here .

Watch device implementations:

• [ 3.8 .4/W-SR-1] Are STRONGLY RECOMMENDED to implement an assistant on the device to handle the Assist action .

Watch device implementations that declare the android.hardware.audio.output feature flag:

• [ 3.10 /W-1-1] MUST support third-party accessibility services.
• [ 3.10 /W-SR-1] Are STRONGLY RECOMMENDED to preload accessibility services on the device comparable with or exceeding functionality of the Switch Access and TalkBack (for languages supported by the preinstalled Text-to-speech engine) accessibility services as provided in the talkback open source project .

If Watch device implementations report the feature android.hardware.audio.output, they:

• [ 3.11 /W-SR-1] Are STRONGLY RECOMMENDED to include a TTS engine supporting the languages available on the device.

• [ 3.11 /W-0-1] MUST support installation of third-party TTS engines.

2.4.4. عملکرد و قدرت

If Watch device implementations include features to improve device power management that are included in AOSP or extend the features that are included in AOSP, they:

• [ 8.3 /W-SR-1] Are STRONGLY RECOMMENDED to provide user affordance to display all apps that are exempted from App Standby and Doze power-saving modes.
• [ 8.3 /W-SR-2] Are STRONGLY RECOMMENDED to provide user affordance to enable and disable the battery saver feature.

Watch device implementations:

• [ 8.4 /W-0-1] MUST provide a per-component power profile that defines the current consumption value for each hardware component and the approximate battery drain caused by the components over time as documented in the Android Open Source Project site.
• [ 8.4 /W-0-2] MUST report all power consumption values in milliampere hours (mAh).
• [ 8.4 /W-0-3] MUST report CPU power consumption per each process's UID. The Android Open Source Project meets the requirement through the uid_cputime kernel module implementation.
• [ 8.4 /W-0-4] MUST make this power usage available via the adb shell dumpsys batterystats shell command to the app developer.
• [ 8.4 /W] SHOULD be attributed to the hardware component itself if unable to attribute hardware component power usage to an application.

2.4.5. مدل امنیتی

Watch device implementations:

• [9/W-0-1] MUST declare the android.hardware.security.model.compatible feature.

If Watch device implementations include multiple users and do not declare the android.hardware.telephony feature flag, they:

• [ 9.5 /W-1-1] MUST support restricted profiles, a feature that allows device owners to manage additional users and their capabilities on the device. With restricted profiles, device owners can quickly set up separate environments for additional users to work in, with the ability to manage finer-grained restrictions in the apps that are available in those environments.

If Watch device implementations include multiple users and declare the android.hardware.telephony feature flag, they:

• [ 9.5 /W-2-1] MUST NOT support restricted profiles but MUST align with the AOSP implementation of controls to enable /disable other users from accessing the voice calls and SMS.

2.5. Automotive Requirements

Android Automotive implementation refers to a vehicle head unit running Android as an operating system for part or all of the system and/or infotainment functionality.

Android device implementations are classified as an Automotive if they declare the feature android.hardware.type.automotive or meet all the following criteria.

• Are embedded as part of, or pluggable to, an automotive vehicle.
• Are using a screen in the driver's seat row as the primary display.

The additional requirements in the rest of this section are specific to Android Automotive device implementations.

2.5.1. سخت افزار

پیاده سازی دستگاه خودرو:

• [ 7.1 .1.1/A-0-1] MUST have a screen at least 6 inches in physical diagonal size.

• [ 7.1 .1.1/A-0-2] MUST have a screen size layout of at least 750 dp x 480 dp.

• [ 7.2 .3/A-0-1] MUST provide the Home function and MAY provide Back and Recent functions.

• [ 7.2 .3/A-0-2] MUST send both the normal and long press event of the Back function ( KEYCODE_BACK ) to the foreground application.

• [ 7.3 /A-0-1] MUST implement and report GEAR_SELECTION , NIGHT_MODE , PERF_VEHICLE_SPEED and PARKING_BRAKE_ON .

• [ 7.3 /A-0-2] The value of the NIGHT_MODE flag MUST be consistent with dashboard day/night mode and SHOULD be based on ambient light sensor input. The underlying ambient light sensor MAY be the same as Photometer .

• [ 7.3 /A-0-3] MUST provide sensor additional info field TYPE_SENSOR_PLACEMENT as part of SensorAdditionalInfo for every sensor provided.

• [ 7.3 /A-SR1] MAY dead reckon Location by fusing GPS/GNSS with additional sensors. If Location is dead reckoned, it is STRONGLY RECOMMENDED to implement and report the corresponding Sensor types and/or Vehicle Property IDs used.

• [ 7.3 /A-0-4] The Location requested via LocationManager#requestLocationUpdates() MUST NOT be map matched.

• [ 7.3 .1/A-0-4] MUST comply with the Android car sensor coordinate system .

• [ 7.3 /A-SR-1] Are STRONGLY_RECOMMENDED to include a 3-axis accelerometer and 3-axis gyroscope.

• [ 7.3 /A-SR-2] Are STRONGLY_RECOMMENDED to implement and report TYPE_HEADING sensor.

If Automotive device implementations support OpenGL ES 3.1, they:

• [ 7.1 .4.1/A-0-1] MUST declare OpenGL ES 3.1 or higher.
• [ 7.1 .4.1/A-0-2] MUST support Vulkan 1.1.
• [ 7.1 .4.1/A-0-3] MUST include Vulkan loader and export all symbols.

If Automotive device implementations include an accelerometer, they:

• [ 7.3 .1/A-1-1] MUST be able to report events up to a frequency of at least 100 Hz.

If device implementations include a 3-axis accelerometer, they:

• [ 7.3 .1/A-SR-1] Are STRONGLY RECOMMENDED to implement the composite sensor for limited axes accelerometer.

If Automotive device implementations include an accelerometer with less than 3 axes, they:

• [ 7.3 .1/A-1-3] MUST implement and report TYPE_ACCELEROMETER_LIMITED_AXES sensor.
• [ 7.3 .1/A-1-4] MUST implement and report TYPE_ACCELEROMETER_LIMITED_AXES_UNCALIBRATED sensor.

If Automotive device implementations include a gyroscope, they:

• [ 7.3 .4/A-2-1] MUST be able to report events up to a frequency of at least 100 Hz.
• [ 7.3 .4/A-2-3] MUST be capable of measuring orientation changes up to 250 degrees per second.
• [ 7.3 .4/A-SR-1] Are STRONGLY RECOMMENDED to configure the gyroscope's measurement range to +/-250dps in order to maximize the resolution possible.

If Automotive device implementations include a 3-axis gyroscope, they:

• [ 7.3 .4/A-SR-2] Are STRONGLY RECOMMENDED to implement the composite sensor for limited axes gyroscope.

If Automotive device implementations include a gyroscope with less than 3-axes, they:

• [ 7.3 .4/A-4-1] MUST implement and report TYPE_GYROSCOPE_LIMITED_AXES sensor.
• [ 7.3 .4/A-4-2] MUST implement and report TYPE_GYROSCOPE_LIMITED_AXES_UNCALIBRATED sensor.

If Automotive device implementations include a GPS/GNSS receiver, but do not include cellular network-based data connectivity, they:

• [ 7.3 .3/A-3-1] MUST determine location the very first time the GPS/GNSS receiver is turned on or after 4+ days within 60 seconds.
• [ 7.3 .3/A-3-2] MUST meet the time-to-first-fix criteria as described in 7.3.3/C-1-2 and 7.3.3/C-1-6 for all other location requests (ie requests which are not the first time ever or after 4+ days). The requirement 7.3.3/C-1-2 is typically met in vehicles without cellular network-based data connectivity, by using GNSS orbit predictions calculated on the receiver, or using the last known vehicle location along with the ability to dead reckon for at least 60 seconds with a position accuracy satisfying 7.3.3/C-1-3 , or a combination of both.

If automotive device implementations include a TYPE_HEADING sensor, they:

• [ 7.3 .4/A-4-3] MUST be able to report events up to a frequency of at least 1 Hz.
• [ 7.3 .4/A-SR-3] STRONGLY_RECOMMENDED to report events up to a frequency of at least 10 Hz.
• SHOULD be in reference to true north.
• SHOULD be available even when the vehicle is still.
• SHOULD have a resolution of at least 1 degree.

پیاده سازی دستگاه خودرو:

• [ 7.4 .3/A-0-1] MUST support Bluetooth and SHOULD support Bluetooth LE.
• [ 7.4 .3/A-0-2] Android Automotive implementations MUST support the following Bluetooth profiles:
  • Phone calling over Hands-Free Profile (HFP).
  • Media playback over Audio Distribution Profile (A2DP).
  • Media playback control over Remote Control Profile (AVRCP).
  • Contact sharing using the Phone Book Access Profile (PBAP).

• [ 7.4 .3/A-SR-1] Are STRONGLY RECOMMENDED to support Message Access Profile (MAP).

• [ 7.4 .5/A] SHOULD include support for cellular network-based data connectivity.

• [ 7.4 .5/A] MAY use the System API NetworkCapabilities#NET_CAPABILITY_OEM_PAID constant for networks that should be available to system apps.

An exterior view camera is a camera that images scenes outside of the device implementation, like the rearview camera.

پیاده سازی دستگاه خودرو:

• SHOULD include one or more exterior view cameras.

If Automotive device implementations include an exterior view camera, for such a camera, they:

• [ 7.5 /A-1-1] MUST NOT have exterior view cameras accessible via the Android Camera APIs , unless they comply with camera core requirements .

• [ 7.5 /A-SR-1] Are STRONGLY RECOMMENDED not to rotate or horizontally mirror the camera preview.

• [ 7.5 /A-SR-2] Are STRONGLY RECOMMENDED to have a resolution of at least 1.3 megapixels.

• SHOULD have either fixed-focus or EDOF (extended depth of field) hardware.

• MAY have either hardware auto-focus or software auto-focus implemented in the camera driver.

If automotive device implementations include one or more exterior view cameras, and load Exterior View System (EVS) service, then for such a camera, they:

• [ 7.5 /A-2-1] MUST NOT rotate or horizontally mirror the camera preview.

پیاده سازی دستگاه خودرو:

• MAY include one or more cameras that are available to third party applications.

If automotive device implementations include at least one camera and make it available to third party applications then, they:

• [ 7.5 /A-3-1] MUST report the feature flag android.hardware.camera.any .
• [ 7.5 /A-3-2] MUST not declare the camera as a system camera .
• MAY support external cameras described in section 7.5.3 .
• MAY include features (such as auto-focus, etc.) available to rear-facing cameras as described in section 7.5.1 .

پیاده سازی دستگاه خودرو:

• [ 7.6 .1/A-0-1] MUST have at least 4 GB of non-volatile storage available for application private data (aka "/data" partition).

• [ 7.6 .1/A] SHOULD format the data partition to offer improved performance and longevity on flash storage, for example using f2fs file-system.

If Automotive device implementations provide shared external storage via a portion of the internal non-removable storage, they:

• [ 7.6 .1/A-SR-1] Are STRONGLY RECOMMENDED to reduce I/O overhead on operations performed on the external storage, for example by using SDCardFS .

If Automotive device implementations are 64-bit:

• [ 7.6 .1/A-2-1] The memory available to the kernel and userspace MUST be at least 816MB if any of the following densities are used:

  • 280dpi or lower on small/normal screens
  • ldpi or lower on extra large screens
  • mdpi or lower on large screens

• [ 7.6 .1/A-2-2] The memory available to the kernel and userspace MUST be at least 944MB if any of the following densities are used:

  • xhdpi or higher on small/normal screens
  • hdpi or higher on large screens
  • mdpi or higher on extra large screens

• [ 7.6 .1/A-2-3] The memory available to the kernel and userspace MUST be at least 1280MB if any of the following densities are used:

  • 400dpi or higher on small/normal screens
  • xhdpi or higher on large screens
  • tvdpi or higher on extra large screens

• [ 7.6 .1/A-2-4] The memory available to the kernel and userspace MUST be at least 1824MB if any of the following densities are used:

  • 560dpi or higher on small/normal screens
  • 400dpi or higher on large screens
  • xhdpi or higher on extra large screens

Note that the "memory available to the kernel and userspace" above refers to the memory space provided in addition to any memory already dedicated to hardware components such as radio, video, and so on that are not under the kernel's control on device implementations.

پیاده سازی دستگاه خودرو:

• [ 7.7 .1/A] SHOULD include a USB port supporting peripheral mode.

پیاده سازی دستگاه خودرو:

• [ 7.8 .1/A-0-1] MUST include a microphone.

پیاده سازی دستگاه خودرو:

• [ 7.8 .2/A-0-1] MUST have an audio output and declare android.hardware.audio.output .

2.5.2. چند رسانه ای

Automotive device implementations MUST support the following audio encoding and decoding formats and make them available to third-party applications:

• [ 5.1 /A-0-1] MPEG-4 AAC Profile (AAC LC)
• [ 5.1 /A-0-2] MPEG-4 HE AAC Profile (AAC+)
• [ 5.1 /A-0-3] AAC ELD (enhanced low delay AAC)

Automotive device implementations MUST support the following video encoding formats and make them available to third-party applications:

• [ 5.2 /A-0-1] H.264 AVC
• [ 5.2 /A-0-2] VP8

Automotive device implementations MUST support the following video decoding formats and make them available to third-party applications:

• [ 5.3 /A-0-1] H.264 AVC
• [ 5.3 /A-0-2] MPEG-4 SP
• [ 5.3 /A-0-3] VP8
• [ 5.3 /A-0-4] VP9

Automotive device implementations are STRONGLY RECOMMENDED to support the following video decoding:

• [ 5.3 /A-SR-1] H.265 HEVC

2.5.3. نرم افزار

پیاده سازی دستگاه خودرو:

• [ 3 /A-0-1] MUST declare the feature android.hardware.type.automotive .

• [ 3 /A-0-2] MUST support uiMode = UI_MODE_TYPE_CAR .

• [ 3 /A-0-3] MUST support all public APIs in the android.car.* namespace.

If Automotive device implementations provide a proprietary API using android.car.CarPropertyManager with android.car.VehiclePropertyIds , they:

• [ 3 /A-1-1] MUST NOT attach special privileges to system application's use of these properties, or prevent third-party applications from using these properties.
• [ 3 /A-1-2] MUST NOT replicate a vehicle property that already exists in the SDK .

پیاده سازی دستگاه خودرو:

• [ 3.2 .1/A-0-1] MUST support and enforce all permissions constants as documented by the Automotive Permission reference page .

• [ 3.2.3.1 /A-0-1] MUST preload one or more applications or service components with an intent handler, for all the public intent filter patterns defined by the following application intents listed here .

• [ 3.4 .1/A-0-1] MUST provide a complete implementation of the android.webkit.Webview API.

• [ 3.8 .3/A-0-1] MUST display notifications that use the Notification.CarExtender API when requested by third-party applications.

• [ 3.8 .4/A-SR-1] Are Strongly Recommended to implement an assistant on the device to handle the Assist action .

If Automotive device implementations include a push-to-talk button, they:

• [ 3.8 .4/A-1-1] MUST use a short press of the push-to-talk button as the designated interaction to launch the user-selected assist app, in other words the app that implements VoiceInteractionService .

پیاده سازی دستگاه خودرو:

• [ 3.8.3.1 /A-0-1] MUST correctly render resources as described in the Notifications on Automotive OS SDK documentation.
• [ 3.8.3.1 /A-0-2] MUST display PLAY and MUTE for notification actions in the place of those provided through Notification.Builder.addAction()
• [ 3.8.3.1 /A] SHOULD restrict the use of rich management tasks such as per-notification-channel controls. MAY use UI affordance per application to reduce controls.

If Automotive device implementations support User HAL properties, they:

• [ 3.9.3 /A-1-1] MUST implement all of the User lifecycle properties
  • INITIAL_USER_INFO , SWITCH_USER , CREATE_USER , REMOVE_USER .

پیاده سازی دستگاه خودرو:

• [ 3.14 /A-0-1] MUST include a UI framework to support third-party apps using the media APIs as described in section 3.14 .
• [ 3.14 /A-0-2] MUST allow the user to safely interact with Media Applications while driving.
• [ 3.14 /A-0-3] MUST support the CAR_INTENT_ACTION_MEDIA_TEMPLATE implicit Intent action with the CAR_EXTRA_MEDIA_PACKAGE extra.
• [ 3.14 /A-0-4] MUST provide an affordance to navigate into a Media Application's preference activity , but MUST only enable it when Car UX Restrictions are not in effect.
• [ 3.14 /A-0-5] MUST display error messages set by Media Applications, and MUST support the optional extras ERROR_RESOLUTION_ACTION_LABEL and ERROR_RESOLUTION_ACTION_INTENT .
• [ 3.14 /A-0-6] MUST support an in-app search affordance for apps that support searching.
• [ 3.14 /A-0-7] MUST respect CONTENT_STYLE_BROWSABLE_HINT and CONTENT_STYLE_PLAYABLE_HINT definitions when displaying the MediaBrowser hierarchy.

If Automotive device implementations include a default launcher app, they:

• [ 3.14 /A-1-1] MUST include media services and open them with the CAR_INTENT_ACTION_MEDIA_TEMPLATE intent.

پیاده سازی دستگاه خودرو:

• [ 3.8 /A] MAY restrict the application requests to enter a full screen mode as described in immersive documentation .
• [ 3.8 /A] MAY keep the status bar and the navigation bar visible at all times.
• [ 3.8 /A] MAY restrict the application requests to change the colors behind the system UI elements, to ensure those elements are clearly visible at all times.

2.5.4. عملکرد و قدرت

پیاده سازی دستگاه خودرو:

• [ 8.2 /A-0-1] MUST report the number of bytes read and written to non-volatile storage per each process's UID so the stats are available to developers through System API android.car.storagemonitoring.CarStorageMonitoringManager . The Android Open Source Project meets the requirement through the uid_sys_stats kernel module.
• [ 8.3 /A-1-3] MUST support Garage Mode .
• [ 8.3 /A] SHOULD be in Garage Mode for at least 15 minutes after every drive unless:
  • The battery is drained.
  • No idle jobs are scheduled.
  • The driver exits Garage Mode.
• [ 8.4 /A-0-1] MUST provide a per-component power profile that defines the current consumption value for each hardware component and the approximate battery drain caused by the components over time as documented in the Android Open Source Project site.
• [ 8.4 /A-0-2] MUST report all power consumption values in milliampere hours (mAh).
• [ 8.4 /A-0-3] MUST report CPU power consumption per each process's UID. The Android Open Source Project meets the requirement through the uid_cputime kernel module implementation.
• [ 8.4 /A] SHOULD be attributed to the hardware component itself if unable to attribute hardware component power usage to an application.
• [ 8.4 /A-0-4] MUST make this power usage available via the adb shell dumpsys batterystats shell command to the app developer.

2.5.5. مدل امنیتی

If Automotive device implementations support multiple users, they:

• [ 9.5 /A-1-1] MUST NOT allow users to interact with nor switch into the Headless System User , except for device provisioning .
• [ 9.5 /A-1-2] MUST switch into a Secondary User before BOOT_COMPLETED .
• [ 9.5 /A-1-3] MUST support the ability to create a Guest User even when the maximum number of Users on a device has been reached.

If Automotive device implementations declare android.hardware.camera.any , then they:

• [ 9.8.2 /A-2-1] MUST display the camera indicator when an app is accessing live camera data, but not when the camera is only being accessed by app(s) holding the roles called out in Section 9.1 Permissions with CDD identifier [C-3-X].
• [ 9.8.2 /A-2-2] MUST not hide the camera indicator for system apps that have visible user interfaces or direct user interaction.

پیاده سازی دستگاه خودرو:

• [ 9.11 /A-0-1] MUST back up the keystore implementation with an isolated execution environment.
• [ 9.11 /A-0-2] MUST have implementations of RSA, AES, ECDSA and HMAC cryptographic algorithms and MD5, SHA1, and SHA-2 family hash functions to properly support the Android Keystore system's supported algorithms in an area that is securely isolated from the code running on the kernel and above. Secure isolation MUST block all potential mechanisms by which kernel or userspace code might access the internal state of the isolated environment, including DMA. The upstream Android Open Source Project (AOSP) meets this requirement by using the Trusty implementation, but another ARM TrustZone-based solution or a third-party reviewed secure implementation of a proper hypervisor-based isolation are alternative options.
• [ 9.11 /A-0-3] MUST perform the lock screen authentication in the isolated execution environment and only when successful, allow the authentication-bound keys to be used. Lock screen credentials MUST be stored in a way that allows only the isolated execution environment to perform lock screen authentication. The upstream Android Open Source Project provides the Gatekeeper Hardware Abstraction Layer (HAL) and Trusty, which can be used to satisfy this requirement.
• [ 9.11 /A-0-4] MUST support key attestation where the attestation signing key is protected by secure hardware and signing is performed in secure hardware. The attestation signing keys MUST be shared across large enough number of devices to prevent the keys from being used as device identifiers. One way of meeting this requirement is to share the same attestation key unless at least 100,000 units of a given SKU are produced. If more than 100,000 units of an SKU are produced, a different key MAY be used for each 100,000 units.
• [9/A-0-1] MUST declare the 'android.hardware.security.model.compatible' feature.

Note that if a device implementation is already launched on an earlier Android version, such a device is exempted from the requirement to have a keystore backed by an isolated execution environment and support the key attestation, unless it declares the android.hardware.fingerprint feature which requires a keystore backed by an isolated execution environment.

پیاده سازی دستگاه خودرو:

• [ 9.14 /A-0-1] MUST gatekeep messages from Android framework vehicle subsystems, eg, allowlisting permitted message types and message sources.
• [ 9.14 /A-0-2] MUST watchdog against denial of service attacks from the Android framework or third-party apps. This guards against malicious software flooding the vehicle network with traffic, which may lead to malfunctioning vehicle subsystems.

2.5.6. Developer Tools and Options Compatibility

پیاده سازی دستگاه خودرو:

• پرفتو
  • [ 6.1 /A-0-1] MUST expose a /system/bin/perfetto binary to the shell user which cmdline complies with the perfetto documentation .
  • [ 6.1 /A-0-2] The perfetto binary MUST accept as input a protobuf config that complies with the schema defined in the perfetto documentation .
  • [ 6.1 /A-0-3] The perfetto binary MUST write as output a protobuf trace that complies with the schema defined in the perfetto documentation .
  • [ 6.1 /A-0-4] MUST provide, through the perfetto binary, at least the data sources described in the perfetto documentation .

2.6. Tablet Requirements

An Android Tablet device refers to an Android device implementation that typically meets all the following criteria:

• Used by holding in both hands.
• Does not have a clamshell or convertible configuration.
• Physical keyboard implementations used with the device connect by means of a standard connection (eg USB, Bluetooth).
• Has a power source that provides mobility, such as a battery.
• Has a screen display size greater than 7” and less than 18", measured diagonally.

Tablet device implementations have similar requirements to handheld device implementations. The exceptions are indicated by an * in that section and noted for reference in this section.

2.6.1. سخت افزار

ژیروسکوپ

If Tablet device implementations include a 3-axis gyroscope, they:

• [ 7.3 .4/Tab-1-1] MUST be capable of measuring orientation changes up to 1000 degrees per second.

Minimum Memory and Storage (Section 7.6.1)

The screen densities listed for small/normal screens in the handheld requirements are not applicable to tablets.

USB peripheral mode (Section 7.7.1)

If tablet device implementations include a USB port supporting peripheral mode, they:

• [ 7.7.1 /Tab] MAY implement the Android Open Accessory (AOA) API.

Virtual Reality Mode (Section 7.9.1)

Virtual Reality High Performance (Section 7.9.2)

Virtual reality requirements are not applicable to tablets.

2.6.2. مدل امنیتی

Keys and Credentials (Section 9.11)

Refer to Section [ 9.11 ].

If Tablet device implementations include multiple users and do not declare the android.hardware.telephony feature flag, they:

• [ 9.5 /T-1-1] MUST support restricted profiles, a feature that allows device owners to manage additional users and their capabilities on the device. With restricted profiles, device owners can quickly set up separate environments for additional users to work in, with the ability to manage finer-grained restrictions in the apps that are available in those environments.

If Tablet device implementations include multiple users and declare the android.hardware.telephony feature flag, they:

• [ 9.5 /T-2-1] MUST NOT support restricted profiles but MUST align with the AOSP implementation of controls to enable /disable other users from accessing the voice calls and SMS.

2.6.2. نرم افزار

• [ 3.2.3.1 /Tab-0-1] MUST preload one or more applications or service components with an intent handler, for all the public intent filter patterns defined by the following application intents listed here .

3. نرم افزار

3.1. Managed API Compatibility

The managed Dalvik bytecode execution environment is the primary vehicle for Android applications. The Android application programming interface (API) is the set of Android platform interfaces exposed to applications running in the managed runtime environment.

پیاده سازی دستگاه:

• [C-0-1] MUST provide complete implementations, including all documented behaviors, of any documented API exposed by the Android SDK or any API decorated with the “@SystemApi” marker in the upstream Android source code.

• [C-0-2] MUST support/preserve all classes, methods, and associated elements marked by the TestApi annotation (@TestApi).

• [C-0-3] MUST NOT omit any managed APIs, alter API interfaces or signatures, deviate from the documented behavior, or include no-ops, except where specifically allowed by this Compatibility Definition.

• [C-0-4] MUST still keep the APIs present and behave in a reasonable way, even when some hardware features for which Android includes APIs are omitted. See section 7 for specific requirements for this scenario.

• [C-0-5] MUST NOT allow third-party apps to use non-SDK interfaces, which are defined as methods and fields in the Java language packages that are in the boot classpath in AOSP, and that do not form part of the public SDK. This includes APIs decorated with the @hide annotation but not with a @SystemAPI , as described in the SDK documents and private and package-private class members.

• [C-0-6] MUST ship with each and every non-SDK interface on the same restricted lists as provided via the provisional and denylist flags in prebuilts/runtime/appcompat/hiddenapi-flags.csv path for the appropriate API level branch in the AOSP.

• [C-0-7] MUST support the signed config dynamic update mechanism to remove non-SDK interfaces from a restricted list by embedding signed configuration in any APK, using the existing public keys present in AOSP.

  However they:

  • MAY, if a hidden API is absent or implemented differently on the device implementation, move the hidden API into the denylist or omit it from all restricted lists.
  • MAY, if a hidden API does not already exist in the AOSP, add the hidden API to any of the restricted lists.

3.1.1. Android Extensions

Android supports extending the managed API surface of a particular API level by updating the extension version for that API level. The android.os.ext.SdkExtensions.getExtensionVersion(int apiLevel) API returns the extension version of the provided apiLevel , if there are extensions for that API level.

Android device implementations:

• [C-0-1] MUST preload the AOSP implementation of both the shared library ExtShared and services ExtServices with versions greater than or equal to the minimum versions allowed per each API level. For example, Android 7.0 device implementations, running API level 24 MUST include at least version 1.

• [C-0-2] MUST only return valid extension version number that have been defined by the AOSP.

• [C-0-3] MUST support all the APIs defined by the extension versions returned by android.os.ext.SdkExtensions.getExtensionVersion(int apiLevel) in the same manner as other managed APIs are supported, following the requirements in section 3.1 .

3.1.2. Android Library

Due to Apache HTTP client deprecation , device implementations:

• [C-0-1] MUST NOT place the org.apache.http.legacy library in the bootclasspath.
• [C-0-2] MUST add the org.apache.http.legacy library to the application classpath only when the app satisfies one of the following conditions:
  • Targets API level 28 or lower.
  • Declares in its manifest that it needs the library by setting the android:name attribute of <uses-library> to org.apache.http.legacy .

The AOSP implementation meets these requirements.

3.2. Soft API Compatibility

In addition to the managed APIs from section 3.1 , Android also includes a significant runtime-only “soft” API, in the form of such things as intents, permissions, and similar aspects of Android applications that cannot be enforced at application compile time.

3.2.1. مجوزها

• [C-0-1] Device implementers MUST support and enforce all permission constants as documented by the Permission reference page . Note that section 9 lists additional requirements related to the Android security model.

3.2.2. Build Parameters

The Android APIs include a number of constants on the android.os.Build class that are intended to describe the current device.

• [C-0-1] To provide consistent, meaningful values across device implementations, the table below includes additional restrictions on the formats of these values to which device implementations MUST conform.

3.2.3. Intent Compatibility

3.2.3.1. Common Application Intents

Android intents allow application components to request functionality from other Android components. The Android upstream project includes a list of applications which implement several intent patterns to perform common actions.

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to preload one or more applications or service components with an intent handler, for all the public intent filter patterns defined by the following application intents listed here and provide fulfillment ie meet with the developer expectation for these common application intents as described in the SDK.

Please refer to Section 2 for mandatory application intents for each device type.

3.2.3.2. Intent Resolution

• [C-0-1] As Android is an extensible platform, device implementations MUST allow each intent pattern referenced in section 3.2.3.1 , except for Settings, to be overridden by third-party applications. The upstream Android open source implementation allows this by default.

• [C-0-2] Device implementers MUST NOT attach special privileges to system applications' use of these intent patterns, or prevent third-party applications from binding to and assuming control of these patterns. This prohibition specifically includes but is not limited to disabling the “Chooser” user interface that allows the user to select between multiple applications that all handle the same intent pattern.

• [C-0-3] Device implementations MUST provide a user interface for users to modify the default activity for intents.

• However, device implementations MAY provide default activities for specific URI patterns (eg http://play.google.com) when the default activity provides a more specific attribute for the data URI. For example, an intent filter pattern specifying the data URI “http://www.android.com” is more specific than the browser's core intent pattern for “http://”.

Android also includes a mechanism for third-party apps to declare an authoritative default app linking behavior for certain types of web URI intents. When such authoritative declarations are defined in an app's intent filter patterns, device implementations:

• [C-0-4] MUST attempt to validate any intent filters by performing the validation steps defined in the Digital Asset Links specification as implemented by the Package Manager in the upstream Android Open Source Project.
• [C-0-5] MUST attempt validation of the intent filters during the installation of the application and set all successfully validated URI intent filters as default app handlers for their URIs.
• MAY set specific URI intent filters as default app handlers for their URIs, if they are successfully verified but other candidate URI filters fail verification. If a device implementation does this, it MUST provide the user appropriate per-URI pattern overrides in the settings menu.
• MUST provide the user with per-app App Links controls in Settings as follows:
  • [C-0-6] The user MUST be able to override holistically the default app links behavior for an app to be: always open, always ask, or never open, which must apply to all candidate URI intent filters equally.
  • [C-0-7] The user MUST be able to see a list of the candidate URI intent filters.
  • The device implementation MAY provide the user with the ability to override specific candidate URI intent filters that were successfully verified, on a per-intent filter basis.
  • [C-0-8] The device implementation MUST provide users with the ability to view and override specific candidate URI intent filters if the device implementation lets some candidate URI intent filters succeed verification while some others can fail.

3.2.3.3. Intent Namespaces

• [C-0-1] Device implementations MUST NOT include any Android component that honors any new intent or broadcast intent patterns using an ACTION, CATEGORY, or other key string in the android.* or com.android.* namespace.
• [C-0-2] Device implementers MUST NOT include any Android components that honor any new intent or broadcast intent patterns using an ACTION, CATEGORY, or other key string in a package space belonging to another organization.
• [C-0-3] Device implementers MUST NOT alter or extend any of the intent patterns listed in section 3.2.3.1 .
• Device implementations MAY include intent patterns using namespaces clearly and obviously associated with their own organization. This prohibition is analogous to that specified for Java language classes in section 3.6 .

3.2.3.4. Broadcast Intents

Third-party applications rely on the platform to broadcast certain intents to notify them of changes in the hardware or software environment.

پیاده سازی دستگاه:

• [C-0-1] MUST broadcast the public broadcast intents listed here in response to appropriate system events as described in the SDK documentation. Note that this requirement is not conflicting with section 3.5 as the limitation for background applications are also described in the SDK documentation. Also certain broadcast intents are conditional upon hardware support, if the device supports the necessary hardware they MUST broadcast the intents and provide the behavior inline with SDK documentation.

3.2.3.5. Conditional Application Intents

Android includes settings that provide users an easy way to select their default applications, for example for Home screen or SMS.

Where it makes sense, device implementations MUST provide a similar settings menu and be compatible with the intent filter pattern and API methods described in the SDK documentation as below.

If device implementations report android.software.home_screen , they:

• [C-1-1] MUST honor the android.settings.HOME_SETTINGS intent to show a default app settings menu for Home Screen.

If device implementations report android.hardware.telephony.calling, they:

• [C-2-1] MUST provide a settings menu that will call the android.provider.Telephony.ACTION_CHANGE_DEFAULT intent to show a dialog to change the default SMS application.

• [C-2-2] MUST honor the android.telecom.action.CHANGE_DEFAULT_DIALER intent to show a dialog to allow the user to change the default Phone application.

  • MUST use the user-selected default Phone app's UI for incoming and outgoing calls except for emergency calls, which would use the preinstalled Phone app.

• [C-2-3] MUST honor the android.telecom.action.CHANGE_PHONE_ACCOUNTS intent to provide user affordance to configure the ConnectionServices associated with the PhoneAccounts , as well as a default PhoneAccount that the telecommunications service provider will use to place outgoing calls. The AOSP implementation meets this requirement by including a "Calling Accounts option" menu within the "Calls" settings menu.

• [C-2-4] MUST allow android.telecom.CallRedirectionService for an app that holds the android.app.role.CALL_REDIRECTION role.

• [C-2-5] MUST provide the user affordance to choose an app that holds the android.app.role.CALL_REDIRECTION role.

• [C-2-6] MUST honor the android.intent.action.SENDTO and android.intent.action.VIEW intents and provide an activity to send/display SMS messages.

• [C-SR-1] Are STRONGLY RECOMMENDED to honor android.intent.action.ANSWER , android.intent.action.CALL , android.intent.action.CALL_BUTTON , android.intent.action.VIEW & android.intent.action.DIAL intents with a preloaded dialer application which can handle these intents and provide fulfillment as described in the SDK.

If device implementations report android.hardware.nfc.hce , they:

• [C-3-1] MUST honor the android.settings.NFC_PAYMENT_SETTINGS intent to show a default app settings menu for Contactless payment.
• [C-3-2] MUST honor android.nfc.cardemulation.action.ACTION_CHANGE_DEFAULT intent to show an activity which opens a dialog to ask the user to change the default card emulation service for a certain category as described in the SDK.

If device implementations report android.hardware.nfc , they:

• [C-4-1] MUST honor these intents android.nfc.action.NDEF_DISCOVERED , android.nfc.action.TAG_DISCOVERED & android.nfc.action.TECH_DISCOVERED , to show an activity which fulfils developer expectations for these intents as described in the SDK.

If device implementations report android.hardware.bluetooth , they:

• [C-5-1] MUST honor the 'android.bluetooth.adapter.action.REQUEST_ENABLE' intent and show a system activity to allow the user to turn on Bluetooth.
• [C-5-2] MUST honor the 'android.bluetooth.adapter.action.REQUEST_DISCOVERABLE' intent and show a system activity that requests discoverable mode.

If device implementations support the DND feature, they:

• [C-6-1] MUST implement an activity that would respond to the intent ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS , which for implementations with UI_MODE_TYPE_NORMAL it MUST be an activity where the user can grant or deny the app access to DND policy configurations.

If device implementations allow users to use third-party input methods on the device, they:

• [C-7-1] MUST provide a user-accessible mechanism to add and configure third-party input methods in response to the android.settings.INPUT_METHOD_SETTINGS intent.

If device implementations support third-party accessibility services, they:

• [C-8-1] MUST honor the android.settings.ACCESSIBILITY_SETTINGS intent to provide a user-accessible mechanism to enable and disable the third-party accessibility services alongside the preloaded accessibility services.

If device implementations include support for Wi-Fi Easy Connect and expose the functionality to third-party apps, they:

• [C-9-1] MUST implement the Settings#ACTION_PROCESS_WIFI_EASY_CONNECT_URI Intent APIs as described in the SDK documentation.

If device implementations provide the data saver mode, they:

• [C-10-1] MUST provide a user interface in the settings, that handles the Settings.ACTION_IGNORE_BACKGROUND_DATA_RESTRICTIONS_SETTINGS intent, allowing users to add applications to or remove applications from the allow list.

If device implementations do not provide the data saver mode, they:

• [C-11-1] MUST have an activity that handles the Settings.ACTION_IGNORE_BACKGROUND_DATA_RESTRICTIONS_SETTINGS intent but MAY implement it as a no-op.

If device implementations declare support for the camera via android.hardware.camera.any , they:

• [C-12-3] MUST handle and MUST only allow preinstalled Android applications to handle the following intents MediaStore.ACTION_IMAGE_CAPTURE , MediaStore.ACTION_IMAGE_CAPTURE_SECURE , and MediaStore.ACTION_VIDEO_CAPTURE as described in the SDK document .

If device implementations report android.software.device_admin , they:

• [C-13-1] MUST honor the intent android.app.action.ADD_DEVICE_ADMIN to invoke a UI to bring the user through adding the device administrator to the system (or allowing them to reject it).

• [C-13-2] MUST honor the intents android.app.action.PROVISION_MANAGED_PROFILE , android.app.action.SET_NEW_PARENT_PROFILE_PASSWORD , android.app.action.SET_NEW_PASSWORD & android.app.action.START_ENCRYPTION and have an activity to provide fulfillment for these intents as described in SDK here .

If device implementations declare the android.software.autofill feature flag, they:

• [C-14-1] MUST fully implement the AutofillService and AutofillManager APIs and honor the android.settings.REQUEST_SET_AUTOFILL_SERVICE intent to show a default app settings menu to enable and disable autofill and change the default autofill service for the user.

If device implementations include a pre-installed app or wish to allow third-party apps to access the usage statistics, they:

• [C-SR-2] are STRONGLY RECOMMENDED provide user-accessible mechanism to grant or revoke access to the usage stats in response to the android.settings.ACTION_USAGE_ACCESS_SETTINGS intent for apps that declare the android.permission.PACKAGE_USAGE_STATS permission.

If device implementations intend to disallow any apps, including pre-installed apps, from accessing the usage statistics, they:

• [C-15-1] MUST still have an activity that handles the android.settings.ACTION_USAGE_ACCESS_SETTINGS intent pattern but MUST implement it as a no-op, that is to have an equivalent behavior as when the user is declined for access.

If device implementations surface links to the activities specified by AutofillService_passwordsActivity in Settings or links to user passwords through a similar mechanism, they:

• [C-16-1] MUST surface such links for all installed autofill services.

• [C-17-1] [Moved to 2.2.3]

If device implementations support the VoiceInteractionService and have more than one application using this API installed at a time, they:

• [C-18-1] MUST honor the android.settings.ACTION_VOICE_INPUT_SETTINGS intent to show a default app settings menu for voice input and assist.

If device implementations report the feature android.hardware.audio.output , they:

• [C-SR-3] Are STRONGLY RECOMMENDED to honor android.intent.action.TTS_SERVICE, android.speech.tts.engine.INSTALL_TTS_DATA & android.speech.tts.engine.GET_SAMPLE_TEXT intents have an activity to provide fulfillment for these intents as described in SDK here .

Android includes support for interactive screensavers, previously referred to as Dreams. Screen Savers allow users to interact with applications when a device connected to a power source is idle or docked in a desk dock. Device Implementations:

• SHOULD include support for screen savers and provide a settings option for users to configure screen savers in response to the android.settings.DREAM_SETTINGS intent.

3.2.4. Activities on secondary/multiple displays

If device implementations allow launching normal Android Activities on more than one display, they:

• [C-1-1] MUST set the android.software.activities_on_secondary_displays feature flag.
• [C-1-2] MUST guarantee API compatibility similar to an activity running on the primary display.
• [C-1-3] MUST land the new activity on the same display as the activity that launched it, when the new activity is launched without specifying a target display via the ActivityOptions.setLaunchDisplayId() API.
• [C-1-4] MUST destroy all activities, when a display with the Display.FLAG_PRIVATE flag is removed.
• [C-1-5] MUST securely hide content on all screens when the device is locked with a secure lock screen, unless the app opts in to show on top of lock screen using Activity#setShowWhenLocked() API.
• SHOULD have android.content.res.Configuration which corresponds to that display in order to be displayed, operate correctly, and maintain compatibility if an activity is launched on secondary display.

If device implementations allow launching normal Android Activities on secondary displays and a secondary display has the android.view.Display.FLAG_PRIVATE flag:

• [C-3-1] Only the owner of that display, system, and activities that are already on that display MUST be able to launch to it. Everyone can launch to a display that has android.view.Display.FLAG_PUBLIC flag.

3.3. Native API Compatibility

Native code compatibility is challenging. For this reason, device implementers are:

• [C-SR-1] STRONGLY RECOMMENDED to use the implementations of the libraries listed below from the upstream Android Open Source Project.

3.3.1. Application Binary Interfaces

Managed Dalvik bytecode can call into native code provided in the application .apk file as an ELF .so file compiled for the appropriate device hardware architecture. As native code is highly dependent on the underlying processor technology, Android defines a number of Application Binary Interfaces (ABIs) in the Android NDK.

پیاده سازی دستگاه:

• [C-0-1] MUST be compatible with one or more defined Android NDK ABIs .
• [C-0-2] MUST include support for code running in the managed environment to call into native code, using the standard Java Native Interface (JNI) semantics.
• [C-0-3] MUST be source-compatible (ie header-compatible) and binary-compatible (for the ABI) with each required library in the list below.
• [C-0-5] MUST accurately report the native Application Binary Interface (ABI) supported by the device, via the android.os.Build.SUPPORTED_ABIS , android.os.Build.SUPPORTED_32_BIT_ABIS , and android.os.Build.SUPPORTED_64_BIT_ABIS parameters, each a comma separated list of ABIs ordered from the most to the least preferred one.

• [C-0-6] MUST report, via the above parameters, a subset of the following list of ABIs and MUST NOT report any ABI not on the list.

  • armeabi (no longer supported as a target by the NDK)
  • armeabi-v7a
  • arm64-v8a
  • x86
  • x86-64

• [C-0-7] MUST make all the following libraries, providing native APIs, available to apps that include native code:

  • libaaudio.so (AAudio native audio support)
  • libamidi.so (native MIDI support, if feature android.software.midi is claimed as described in Section 5.9)
  • libandroid.so (native Android activity support)
  • libc (C library)
  • libcamera2ndk.so
  • libdl (dynamic linker)
  • libEGL.so (native OpenGL surface management)
  • libGLESv1_CM.so (OpenGL ES 1.x)
  • libGLESv2.so (OpenGL ES 2.0)
  • libGLESv3.so (OpenGL ES 3.x)
  • libicui18n.so
  • libicuuc.so
  • libjnigraphics.so
  • liblog (Android logging)
  • libmediandk.so (native media APIs support)
  • libm (math library)
  • libneuralnetworks.so (Neural Networks API)
  • libOpenMAXAL.so (OpenMAX AL 1.0.1 support)
  • libOpenSLES.so (OpenSL ES 1.0.1 audio support)
  • libRS.so
  • libstdc++ (Minimal support for C++)
  • libvulkan.so (Vulkan)
  • libz (Zlib compression)
  • JNI interface

• [C-0-8] MUST NOT add or remove the public functions for the native libraries listed above.

• [C-0-9] MUST list additional non-AOSP libraries exposed directly to third-party apps in /vendor/etc/public.libraries.txt .

• [C-0-10] MUST NOT expose any other native libraries, implemented and provided in AOSP as system libraries, to third-party apps targeting API level 24 or higher as they are reserved.

• [C-0-11] MUST export all the OpenGL ES 3.1 and Android Extension Pack function symbols, as defined in the NDK, through the libGLESv3.so library. Note that while all the symbols MUST be present, section 7.1.4.1 describes in more detail the requirements for when the full implementation of each corresponding functions are expected.

• [C-0-12] MUST export function symbols for the core Vulkan 1.0 function symbols, as well as the VK_KHR_surface , VK_KHR_android_surface , VK_KHR_swapchain , VK_KHR_maintenance1 , and VK_KHR_get_physical_device_properties2 extensions through the libvulkan.so library. Note that while all the symbols MUST be present, section 7.1.4.2 describes in more detail the requirements for when the full implementation of each corresponding functions are expected.

• SHOULD be built using the source code and header files available in the upstream Android Open Source Project

Note that future releases of Android may introduce support for additional ABIs.

3.3.2. 32-bit ARM Native Code Compatibility

If device implementations report the support of the armeabi ABI, they:

• [C-3-1] MUST also support armeabi-v7a and report its support, as armeabi is only for backwards compatibility with older apps.

If device implementations report the support of the armeabi-v7a ABI, for apps using this ABI, they:

• [C-2-1] MUST include the following lines in /proc/cpuinfo , and SHOULD NOT alter the values on the same device, even when they are read by other ABIs.

  • Features: , followed by a list of any optional ARMv7 CPU features supported by the device.
  • CPU architecture: , followed by an integer describing the device's highest supported ARM architecture (eg, "8" for ARMv8 devices).

• [C-2-2] MUST always keep the following operations available, even in the case where the ABI is implemented on an ARMv8 architecture, either through native CPU support or through software emulation:

  • SWP and SWPB instructions.
  • CP15ISB, CP15DSB, and CP15DMB barrier operations.

• [C-2-3] MUST include support for the Advanced SIMD (aka NEON) extension.

3.4. سازگاری وب

3.4.1. WebView Compatibility

If device implementations provide a complete implementation of the android.webkit.Webview API, they:

• [C-1-1] MUST report android.software.webview .
• [C-1-2] MUST use the Chromium Project build from the upstream Android Open Source Project on the Android 13 branch for the implementation of the android.webkit.WebView API.

• [C-1-3] The user agent string reported by the WebView MUST be in this format:

  Mozilla/5.0 (Linux; Android $(VERSION); [$(MODEL)] [Build/$(BUILD)]; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 $(CHROMIUM_VER) Mobile Safari/537.36

  • The value of the $(VERSION) string MUST be the same as the value for android.os.Build.VERSION.RELEASE.
  • The $(MODEL) string MAY be empty, but if it is not empty it MUST have the same value as android.os.Build.MODEL.
  • "Build/$(BUILD)" MAY be omitted, but if it is present the $(BUILD) string MUST be the same as the value for android.os.Build.ID.
  • The value of the $(CHROMIUM_VER) string MUST be the version of Chromium in the upstream Android Open Source Project.
  • Device implementations MAY omit Mobile in the user agent string.

• The WebView component SHOULD include support for as many HTML5 features as possible and if it supports the feature SHOULD conform to the HTML5 specification .

• [C-1-4] MUST render the provided content or remote URL content in a process that is distinct from the application that instantiates the WebView. Specifically the separate renderer process MUST hold lower privilege, run as a separate user ID, have no access to the app's data directory, have no direct network access, and only have access to the minimum-required system services over Binder. The AOSP implementation of WebView meets this requirement.

Note that if device implementations are 32-bit or declare the feature flag android.hardware.ram.low , they are exempted from C-1-3.

3.4.2. سازگاری مرورگر

If device implementations include a standalone Browser application for general web browsing, they:

• [C-1-1] MUST support each of these APIs associated with HTML5:
  • application cache/offline operation
  • <video> tag
  • موقعیت جغرافیایی
• [C-1-2] MUST support the HTML5/W3C webstorage API and SHOULD support the HTML5/W3C IndexedDB API . Note that as the web development standards bodies are transitioning to favor IndexedDB over webstorage, IndexedDB is expected to become a required component in a future version of Android.
• MAY ship a custom user agent string in the standalone Browser application.
• SHOULD implement support for as much of HTML5 as possible on the standalone Browser application (whether based on the upstream WebKit Browser application or a third-party replacement).

However, If device implementations do not include a standalone Browser application, they:

• [C-2-1] MUST still support the public intent patterns as described in section 3.2.3.1 .

3.5. API Behavioral Compatibility

پیاده سازی دستگاه:

• [C-0-9] MUST ensure that API behavioral compatibility is applied for all installed apps unless they are restricted as described in Section 3.5.1 .
• [C-0-10] MUST NOT implement the allowlisting approach that ensures API behavioral compatibility only for apps that are selected by device implementers.

The behaviors of each of the API types (managed, soft, native, and web) must be consistent with the preferred implementation of the upstream Android Open Source Project . Some specific areas of compatibility are:

• [C-0-1] Devices MUST NOT change the behavior or semantics of a standard intent.
• [C-0-2] Devices MUST NOT alter the lifecycle or lifecycle semantics of a particular type of system component (such as Service, Activity, ContentProvider, etc.).
• [C-0-3] Devices MUST NOT change the semantics of a standard permission.
• Devices MUST NOT alter the limitations enforced on background applications. More specifically, for background apps:
  • [C-0-4] they MUST stop executing callbacks that are registered by the app to receive outputs from the GnssMeasurement and GnssNavigationMessage .
  • [C-0-5] they MUST rate-limit the frequency of updates that are provided to the app through the LocationManager API class or the WifiManager.startScan() method.
  • [C-0-6] if the app is targeting API level 25 or higher, they MUST NOT allow to register broadcast receivers for the implicit broadcasts of standard Android intents in the app's manifest, unless the broadcast intent requires a "signature" or "signatureOrSystem" protectionLevel permission or are on the exemption list .
  • [C-0-7] if the app is targeting API level 25 or higher, they MUST stop the app's background services, just as if the app had called the services' stopSelf() method, unless the app is placed on a temporary allowlist to handle a task that's visible to the user.
  • [C-0-8] if the app is targeting API level 25 or higher, they MUST release the wakelocks the app holds.
• [C-0-11] Devices MUST return the following security providers as the first seven array values from the Security.getProviders() method, in the given order and with the given names (as returned by Provider.getName() ) and classes, unless the app has modified the list via insertProviderAt() or removeProvider() . Devices MAY return additional providers after the specified list of providers below.
  1. AndroidNSSP - android.security.net.config.NetworkSecurityConfigProvider
  2. AndroidOpenSSL - com.android.org.conscrypt.OpenSSLProvider
  3. CertPathProvider - sun.security.provider.CertPathProvider
  4. AndroidKeyStoreBCWorkaround - android.security.keystore.AndroidKeyStoreBCWorkaroundProvider
  5. BC - com.android.org.bouncycastle.jce.provider.BouncyCastleProvider
  6. HarmonyJSSE - com.android.org.conscrypt.JSSEProvider
  7. AndroidKeyStore - android.security.keystore.AndroidKeyStoreProvider

The above list is not comprehensive. The Compatibility Test Suite (CTS) tests significant portions of the platform for behavioral compatibility, but not all. It is the responsibility of the implementer to ensure behavioral compatibility with the Android Open Source Project. For this reason, device implementers SHOULD use the source code available via the Android Open Source Project where possible, rather than re-implement significant parts of the system.

3.5.1. Application Restriction

If device implementations implement a proprietary mechanism to restrict apps (eg changing or restricting API behaviors that are described in the SDK) and that mechanism is more restrictive than the Restricted App Standby Bucket , they:

• [C-1-1] MUST allow the user to see the list of restricted apps.
• [C-1-2] MUST provide user affordance to turn on / off all of these proprietary restrictions on each app.

• [C-1-3] MUST not automatically apply these proprietary restrictions without evidence of poor system health behavior, but MAY apply the restrictions on apps upon detection of poor system health behavior like stuck wakelocks, long running services, and other criteria. The criteria MAY be determined by device implementers but MUST be related to the app's impact on the system health. Other criteria that are not purely related to the system health, such as the app's lack of popularity in the market, MUST NOT be used as criteria.

• [C-1-4] MUST not automatically apply these proprietary restrictions for apps when a user has turned off app restrictions manually, and MAY suggest the user to apply these proprietary restrictions.

• [C-1-5] MUST inform users if these proprietary restrictions are applied to an app automatically. Such information MUST be provided in the 24-hour period preceding the application of these proprietary restrictions.

• [C-1-6] MUST return true for the ActivityManager.isBackgroundRestricted() method for any API calls from an app.

• [C-1-7] MUST NOT restrict the top foreground app that is explicitly used by the user.

• [C-1-8] MUST suspend these proprietary restrictions on an app whenever a user starts to explicitly use the app, making it the top foreground application.

• [C-1-10] MUST provide a public and clear document or website that describes how proprietary restrictions are applied. This document or website MUST be linkable from the Android SDK documents and MUST include:

  • Triggering conditions for proprietary restrictions.
  • What and how an app can be restricted.
  • How an app can be exempted from such restrictions.
  • How an app can request an exemption from proprietary restrictions, if they support such an exemption for apps the user can install.

If an app is pre-installed on the device and has never been explicitly used by a user for more than 30 days, [C-1-3] [C-1-5] are exempted.

If device implementations extend the app restrictions that are implemented in AOSP, they:

• [C-2-1]MUST follow the implementation described in this document .

3.5.2. Application Hibernation

If device implementations include App Hibernation that is included in AOSP or extends the feature that is included in AOSP, then they:

• [C-1-1] MUST meet all the requirements in section 3.5.1 except for [C-1-6] and [C-1-3].
• [C-1-2] MUST only apply the restriction on the app for a user when there is evidence that the user has not used the app for some period of time. This duration is STRONGLY RECOMMENDED to be one month or longer. Usage MUST be defined by either explicit user interaction via the UsageStats#getLastTimeVisible() API or anything that would cause an app to leave the force-stopped state, including service bindings, content provider bindings, explicit broadcasts, etc., which will be tracked by a new API UsageStats#getLastTimeAnyComponentUsed().
• [C-1-3] MUST only apply restrictions affecting all device users when there is evidence that the package has not been used by ANY user for some period of time. This duration is STRONGLY RECOMMENDED to be one month or longer.
• [C-1-4] MUST NOT render the app unable to respond to activity intents, service bindings, content provider requests, or explicit broadcasts.

App Hibernation in AOSP meets the above requirements.

3.6. API Namespaces

Android follows the package and class namespace conventions defined by the Java programming language. To ensure compatibility with third-party applications, device implementers MUST NOT make any prohibited modifications (see below) to these package namespaces:

• java.*
• javax.*
• sun.*
• android.*
• androidx.*
• com.android.*

That is, they:

• [C-0-1] MUST NOT modify the publicly exposed APIs on the Android platform by changing any method or class signatures, or by removing classes or class fields.
• [C-0-2] MUST NOT add any publicly exposed elements (such as classes or interfaces, or fields or methods to existing classes or interfaces) or Test or System APIs to the APIs in the above namespaces. A "publicly exposed element" is any construct that is not decorated with the "@hide" marker as used in the upstream Android source code.

Device implementers MAY modify the underlying implementation of the APIs, but such modifications:

• [C-0-3] MUST NOT impact the stated behavior and Java-language signature of any publicly exposed APIs.
• [C-0-4] MUST NOT be advertised or otherwise exposed to developers.

However, device implementers MAY add custom APIs outside the standard Android namespace, but the custom APIs:

• [C-0-5] MUST NOT be in a namespace owned by or referring to another organization. For instance, device implementers MUST NOT add APIs to the com.google.* or similar namespace: only Google may do so. Similarly, Google MUST NOT add APIs to other companies' namespaces.
• [C-0-6] MUST be packaged in an Android shared library so that only apps that explicitly use them (via the <uses-library> mechanism) are affected by the increased memory usage of such APIs.

Device implementers MAY add custom APIs in native languages, outside of the NDK APIs, but the custom APIs:

• [C-1-1] MUST NOT be in a NDK library or a library owned by another organization as described here .

If a device implementer proposes to improve one of the package namespaces above (such as by adding useful new functionality to an existing API, or adding a new API), the implementer SHOULD visit source.android.com and begin the process for contributing changes and code, according to the information on that site.

Note that the restrictions above correspond to standard conventions for naming APIs in the Java programming language; this section simply aims to reinforce those conventions and make them binding through inclusion in this Compatibility Definition.

3.7. سازگاری زمان اجرا

پیاده سازی دستگاه:

• [C-0-1] MUST support the full Dalvik Executable (DEX) format and Dalvik bytecode specification and semantics .

• [C-0-2] MUST configure Dalvik runtimes to allocate memory in accordance with the upstream Android platform, and as specified by the following table. (See section 7.1.1 for screen size and screen density definitions.)

• SHOULD use Android RunTime (ART), the reference upstream implementation of the Dalvik Executable Format, and the reference implementation's package management system.

• SHOULD run fuzz tests under various modes of execution and target architectures to assure the stability of the runtime. Refer to JFuzz and DexFuzz in the Android Open Source Project website.

Note that memory values specified below are considered minimum values and device implementations MAY allocate more memory per application.

3.8. User Interface Compatibility

3.8.1. Launcher (Home Screen)

Android includes a launcher application (home screen) and support for third-party applications to replace the device launcher (home screen).

If device implementations allow third-party applications to replace the device home screen, they:

• [C-1-1] MUST declare the platform feature android.software.home_screen .
• [C-1-2] MUST return the AdaptiveIconDrawable object when the third-party application use <adaptive-icon> tag to provide their icon, and the PackageManager methods to retrieve icons are called.

If device implementations include a default launcher that supports in-app pinning of shortcuts, they:

• [C-2-1] MUST report true for ShortcutManager.isRequestPinShortcutSupported() .
• [C-2-2] MUST have user affordance asking the user before adding a shortcut requested by apps via the ShortcutManager.requestPinShortcut() API method.
• [C-2-3] MUST support pinned shortcuts and dynamic and static shortcuts as documented on the App Shortcuts page .

Conversely, if device implementations do not support in-app pinning of shortcuts, they:

• [C-3-1] MUST report false for ShortcutManager.isRequestPinShortcutSupported() .

If device implementations implement a default launcher that provides quick access to the additional shortcuts provided by third-party apps through the ShortcutManager API, they:

• [C-4-1] MUST support all documented shortcut features (eg static and dynamic shortcuts, pinning shortcuts) and fully implement the APIs of the ShortcutManager API class.

If device implementations include a default launcher app that shows badges for the app icons, they:

• [C-5-1] MUST respect the NotificationChannel.setShowBadge() API method. In other words, show a visual affordance associated with the app icon if the value is set as true , and do not show any app icon badging scheme when all of the app's notification channels have set the value as false .
• MAY override the app icon badges with their proprietary badging scheme when third-party applications indicate support of the proprietary badging scheme through the use of proprietary APIs, but SHOULD use the resources and values provided through the notification badges APIs described in the SDK , such as the Notification.Builder.setNumber() and the Notification.Builder.setBadgeIconType() API.

If device implementations support monochrome icons, these icons:

• [C-6-1] MUST be used only when a user explicitly enables them (eg via Settings or wallpaper picker menu).

3.8.2. ابزارک ها

Android supports third-party app widgets by defining a component type and corresponding API and lifecycle that allows applications to expose an “AppWidget” to the end user.

If device implementations support third-party app widgets, they:

• [C-1-1] MUST declare support for platform feature android.software.app_widgets .
• [C-1-2] MUST include built-in support for AppWidgets and expose user interface affordances to add, configure, view, and remove AppWidgets.
• [C-1-3] MUST be capable of rendering widgets that are 4 x 4 in the standard grid size. See the App Widget DesignGuidelines in the Android SDK documentation for details.
• MAY support application widgets on the lock screen.

If device implementations support third-party app widgets and in-app pinning of shortcuts, they:

• [C-2-1] MUST report true for AppWidgetManager.html.isRequestPinAppWidgetSupported() .
• [C-2-2] MUST have user affordance asking the user before adding a shortcut requested by apps via the AppWidgetManager.requestPinAppWidget() API method.

3.8.3. اطلاعیه ها

Android includes Notification and NotificationManager APIs that allow third-party app developers to notify users of notable events and attract users' attention using the hardware components (eg sound, vibration and light) and software features (eg notification shade, system bar) of the device .

3.8.3.1. Presentation of Notifications

If device implementations allow third-party apps to notify users of notable events , they:

• [C-1-1] MUST support notifications that use hardware features, as described in the SDK documentation, and to the extent possible with the device implementation hardware. For instance, if a device implementation includes a vibrator, it MUST correctly implement the vibration APIs. If a device implementation lacks hardware, the corresponding APIs MUST be implemented as no-ops. This behavior is further detailed in section 7 .
• [C-1-2] MUST correctly render all resources (icons, animation files, etc.) provided for in the APIs, or in the Status/System Bar icon style guide , although they MAY provide an alternative user experience for notifications than that provided by the reference Android Open Source implementation.
• [C-1-3] MUST honor and implement properly the behaviors described for the APIs to update, remove and group notifications.
• [C-1-4] MUST provide the full behavior of the NotificationChannel API documented in the SDK.
• [C-1-5] MUST provide a user affordance to block and modify a certain third-party app's notification per each channel and app package level.
• [C-1-6] MUST also provide a user affordance to display deleted notification channels.
• [C-1-7] MUST correctly render all resources (images, stickers, icons, etc.) provided through Notification.MessagingStyle alongside the notification text without additional user interaction. For example, MUST show all resources including icons provided through android.app.Person in a group conversation that is set through setGroupConversation .
• [C-SR-1] Are STRONGLY RECOMMENDED to provide an affordance for the user to control the notifications that are exposed to apps that have been granted the Notification Listener permission. The granularity MUST be so that the user can control for each such notification listener what notification types are bridged to this listener. The types MUST include "conversations", "alerting", "silent", and "important ongoing" notifications.
• [C-SR-2] Are STRONGLY RECOMMENDED provide an affordance for users to specify apps to exclude from notifying any specific notification listener.
• [C-SR-3] Are STRONGLY RECOMMENDED to automatically surface a user affordance to block a certain third-party app's notification per each channel and app package level after the user dismisses that notification multiple times.
• SHOULD support rich notifications.
• SHOULD present some higher priority notifications as heads-up notifications.
• SHOULD have a user affordance to snooze notifications.
• MAY only manage the visibility and timing of when third-party apps can notify users of notable events to mitigate safety issues such as driver distraction.

Android 11 introduces support for conversation notifications, which are notifications that use MessagingStyle and provides a published People Shortcut ID.

پیاده سازی دستگاه:

• [C-SR-4] Are STRONGLY RECOMMENDED to group and display conversation notifications ahead of non conversation notifications with the exception of ongoing foreground service notifications and importance:high notifications.

If device implementations support conversation notifications and the app provides the required data for bubbles , they:

• [C-SR-5] Are STRONGLY RECOMMENDED to display this conversation as a bubble. The AOSP implementation meets these requirements with the default System UI, Settings, and Launcher.

If device implementations support rich notifications, they:

• [C-2-1] MUST use the exact resources as provided through the Notification.Style API class and its subclasses for the presented resource elements.
• SHOULD present each and every resource element (eg icon, title and summary text) defined in the Notification.Style API class and its subclasses.

Heads up notifications are notifications that are presented to the user as they come in independently of the surface the user is on. If device implementations support heads-up notifications, then they:

• [C-3-1] MUST use the heads-up notification view and resources as described in the Notification.Builder API class when heads-up notifications are presented.
• [C-3-2] MUST display the actions provided through Notification.Builder.addAction() together with the notification content without additional user interaction as described in the SDK .

3.8.3.2. Notification Listener Service

Android includes the NotificationListenerService APIs that allow apps (once explicitly enabled by the user) to receive a copy of all notifications as they are posted or updated.

پیاده سازی دستگاه:

• [C-0-1] MUST correctly and promptly update notifications in their entirety to all such installed and user-enabled listener services, including any and all metadata attached to the Notification object.
• [C-0-2] MUST respect the snoozeNotification() API call, and dismiss the notification and make a callback after the snooze duration that is set in the API call.

If device implementations have a user affordance to snooze notifications, they:

• [C-1-1] MUST reflect the snoozed notification status properly through the standard APIs such as NotificationListenerService.getSnoozedNotifications() .
• [C-1-2] MUST make this user affordance available to snooze notifications from each installed third-party app's, unless they are from persistent/foreground services.

3.8.3.3. DND (Do not Disturb)/ Priority Mode

If device implementations support the DND feature (also called Priority Mode), they:

• [C-1-1] MUST, for when the device implementation has provided a means for the user to grant or deny third-party apps to access the DND policy configuration, display Automatic DND rules created by applications alongside the user-created and pre-defined rules.
• [C-1-3] MUST honor the suppressedVisualEffects values passed along the NotificationManager.Policy and if an app has set any of the SUPPRESSED_EFFECT_SCREEN_OFF or SUPPRESSED_EFFECT_SCREEN_ON flags, it SHOULD indicate to the user that the visual effects are suppressed in the DND settings menu.

3.8.4. Assist API's

Android includes the Assist APIs to allow applications to elect how much information of the current context is shared with the assistant on the device.

اگر پیاده‌سازی‌های دستگاه از عمل Assist پشتیبانی می‌کنند، آنها:

• [C-2-1] MUST indicate clearly to the end user when the context is shared, by either:
  • Each time the assist app accesses the context, displaying a white light around the edges of the screen that meet or exceed the duration and brightness of the Android Open Source Project implementation.
  • برای برنامه کمکی از پیش نصب‌شده، امکان ارائه هزینه کمتر از دو پیمایش برای کاربر به دور از ورودی صوتی پیش‌فرض و منوی تنظیمات برنامه دستیار ، و اشتراک‌گذاری متن تنها زمانی که برنامه کمک به صراحت توسط کاربر از طریق کلیدواژه یا ورودی کلید پیمایش کمکی فراخوانی شده باشد.
• [C-2-2] The designated interaction to launch the assist app as described in section 7.2.3 MUST launch the user-selected assist app, in other words the app that implements VoiceInteractionService , or an activity handling the ACTION_ASSIST intent.

3.8.5. Alerts and Toasts

Applications can use the Toast API to display short non-modal strings to the end user that disappear after a brief period of time, and use the TYPE_APPLICATION_OVERLAY window type API to display alert windows as an overlay over other apps.

اگر پیاده سازی های دستگاه شامل یک صفحه نمایش یا خروجی ویدیو باشد، آنها:

• [C-1-1] MUST provide a user affordance to block an app from displaying alert windows that use the TYPE_APPLICATION_OVERLAY . The AOSP implementation meets this requirement by having controls in the notification shade.

• [C-1-2] باید به API Toast احترام بگذارد و نان تست‌ها را از برنامه‌ها برای کاربران نهایی به شیوه‌ای بسیار قابل مشاهده نمایش دهد.

3.8.6. تم ها

Android provides “themes” as a mechanism for applications to apply styles across an entire Activity or application.

Android includes a “Holo” and "Material" theme family as a set of defined styles for application developers to use if they want to match the Holo theme look and feel as defined by the Android SDK.

اگر پیاده سازی های دستگاه شامل یک صفحه نمایش یا خروجی ویدیو باشد، آنها:

• [C-1-1] MUST NOT alter any of the Holo theme attributes exposed to applications.
• [C-1-2] MUST support the “Material” theme family and MUST NOT alter any of the Material theme attributes or their assets exposed to applications.

• [C-1-3] MUST either set the "sans-serif" font family to Roboto version 2.x for the languages that Roboto supports, or provide a user affordance to change the font used for the "sans-serif" font family to Roboto version 2.x for the languages that Roboto supports.

• [C-1-4] MUST generate dynamic color tonal palettes as specified in the AOSP documentation of Settings.THEME_CUSTOMIZATION_OVERLAY_PACKAGES (see android.theme.customization.system_palette and android.theme.customization.theme_style ).

• [C-1-5] MUST generate dynamic color tonal palettes using color theme styles enumerated in the Settings.THEME_CUSTOMIZATION_OVERLAY_PACKAGES documentation (see android.theme.customization.theme_styles ), namely TONAL_SPOT , VIBRANT , EXPRESSIVE , SPRITZ , RAINBOW , FRUIT_SALAD .

  "Source color" used to generate dynamic color tonal palettes when sent with android.theme.customization.system_palette (as documented in Settings.THEME_CUSTOMIZATION_OVERLAY_PACKAGES ).

• [C-1-6] MUST have a CAM16 chroma value of 5 or larger.

  • SHOULD be derived from the wallpaper via com.android.systemui.monet.ColorScheme#getSeedColors , which provides multiple valid source colors to pick one from.

  • SHOULD use the value 0xFF1B6EF3 , if none of the provided colors meet the above source color requirement.

Android also includes a “Device Default” theme family as a set of defined styles for application developers to use if they want to match the look and feel of the device theme as defined by the device implementer.

• Device implementations MAY modify the Device Default theme attributes exposed to applications.

Android supports a variant theme with translucent system bars, which allows application developers to fill the area behind the status and navigation bar with their app content. To enable a consistent developer experience in this configuration, it is important the status bar icon style is maintained across different device implementations.

If device implementations include a system status bar, they:

• [C-2-1] MUST use white for system status icons (such as signal strength and battery level) and notifications issued by the system, unless the icon is indicating a problematic status or an app requests a light status bar using the WindowInsetsController#APPEARANCE_LIGHT_STATUS_BARS flag.
• [C-2-2] Android device implementations MUST change the color of the system status icons to black (for details, refer to R.style ) when an app requests a light status bar.

3.8.7. تصاویر پس زمینه زنده

Android defines a component type and corresponding API and lifecycle that allows applications to expose one or more “Live Wallpapers” to the end user. Live wallpapers are animations, patterns, or similar images with limited input capabilities that display as a wallpaper, behind other applications.

Hardware is considered capable of reliably running live wallpapers if it can run all live wallpapers, with no limitations on functionality, at a reasonable frame rate with no adverse effects on other applications. If limitations in the hardware cause wallpapers and/or applications to crash, malfunction, consume excessive CPU or battery power, or run at unacceptably low frame rates, the hardware is considered incapable of running live wallpaper. As an example, some live wallpapers may use an OpenGL 2.0 or 3.x context to render their content. Live wallpaper will not run reliably on hardware that does not support multiple OpenGL contexts because the live wallpaper use of an OpenGL context may conflict with other applications that also use an OpenGL context.

• Device implementations capable of running live wallpapers reliably as described above SHOULD implement live wallpapers.

If device implementations implement live wallpapers, they:

• [C-1-1] MUST report the platform feature flag android.software.live_wallpaper.

3.8.8. Activity Switching

The upstream Android source code includes the overview screen , a system-level user interface for task switching and displaying recently accessed activities and tasks using a thumbnail image of the application's graphical state at the moment the user last left the application.

Device implementations including the recents function navigation key as detailed in section 7.2.3 MAY alter the interface.

If device implementations including the recents function navigation key as detailed in section 7.2.3 alter the interface, they:

• [C-1-1] MUST support at least up to 7 displayed activities.
• SHOULD at least display the title of 4 activities at a time.
• [C-1-2] MUST implement the screen pinning behavior and provide the user with a settings menu to toggle the feature.
• SHOULD display highlight color, icon, screen title in recents.
• SHOULD display a closing affordance ("x") but MAY delay this until user interacts with screens.
• SHOULD implement a shortcut to switch easily to the previous activity.
• SHOULD trigger the fast-switch action between the two most recently used apps, when the recents function key is tapped twice.
• SHOULD trigger the split-screen multiwindow-mode, if supported, when the recents functions key is long pressed.
• MAY display affiliated recents as a group that moves together.
• [C-SR-1] Are STRONGLY RECOMMENDED to use the upstream Android user interface (or a similar thumbnail-based interface) for the overview screen.

3.8.9. مدیریت ورودی

Android includes support for Input Management and support for third-party input method editors.

If device implementations allow users to use third-party input methods on the device, they:

• [C-1-1] MUST declare the platform feature android.software.input_methods and support IME APIs as defined in the Android SDK documentation.

3.8.10. Lock Screen Media Control

The Remote Control Client API is deprecated from Android 5.0 in favor of the Media Notification Template that allows media applications to integrate with playback controls that are displayed on the lock screen.

3.8.11. Screen savers (previously Dreams)

See section 3.2.3.5 for settings intent to congfigure screen savers.

3.8.12. مکان

If device implementations include a hardware sensor (eg GPS) that is capable of providing the location coordinates, they

• [C-1-2] MUST display the current status of location in the Location menu within Settings.
• [C-1-3] MUST NOT display location modes in the Location menu within Settings.

3.8.13. Unicode and Font

Android includes support for the emoji characters defined in Unicode 10.0 .

اگر پیاده سازی های دستگاه شامل یک صفحه نمایش یا خروجی ویدیو باشد، آنها:

• [C-1-1] MUST be capable of rendering these emoji characters in color glyph.
• [C-1-2] MUST include support for:
  • Roboto 2 font with different weights—sans-serif-thin, sans-serif-light, sans-serif-medium, sans-serif-black, sans-serif-condensed, sans-serif-condensed-light for the languages available on the دستگاه
  • Full Unicode 7.0 coverage of Latin, Greek, and Cyrillic, including the Latin Extended A, B, C, and D ranges, and all glyphs in the currency symbols block of Unicode 7.0.
• [C-1-3] MUST NOT remove or modify NotoColorEmoji.tff in the system image. (It is acceptable to add a new emoji font to override emoji in NotoColorEmoji.tff)
• SHOULD support the skin tone and diverse family emojis as specified in the Unicode Technical Report #51 .

If device implementations include an IME, they:

• SHOULD provide an input method to the user for these emoji characters.

Android includes support to render Myanmar fonts. Myanmar has several non-Unicode compliant fonts, commonly known as “Zawgyi,” for rendering Myanmar languages.

If device implementations include support for Burmese, they:

• [C-2-1] MUST render text with Unicode compliant font as default; non-Unicode compliant font MUST NOT be set as default font unless the user chooses it in the language picker.
• [C-2-2] MUST support a Unicode font and a non-Unicode compliant font if a non-Unicode compliant font is supported on the device. Non-Unicode compliant font MUST NOT remove or overwrite the Unicode font.
• [C-2-3] MUST render text with non-Unicode compliant font ONLY IF a language code with script code Qaag is specified (eg my-Qaag). No other ISO language or region codes (whether assigned, unassigned, or reserved) can be used to refer to non-Unicode compliant font for Myanmar. App developers and web page authors can specify my-Qaag as the designated language code as they would for any other language.

3.8.14. Multi-windows

If device implementations have the capability to display multiple activities at the same time, they:

• [C-1-1] MUST implement such multi-window mode(s) in accordance with the application behaviors and APIs described in the Android SDK multi-window mode support documentation and meet the following requirements:
• [C-1-2] MUST honor android:resizeableActivity that is set by an app in the AndroidManifest.xml file as described in this SDK .
• [C-1-3] MUST NOT offer split-screen or freeform mode if the screen height is less than 440 dp and the screen width is less than 440 dp.
• [C-1-4] An activity MUST NOT be resized to a size smaller than 220dp in multi-window modes other than picture-in-picture.
• Device implementations with screen size xlarge SHOULD support freeform mode.

If device implementations support multi-window mode(s), and the split screen mode, they:

• [C-2-2] MUST crop the docked activity of a split-screen multi-window but SHOULD show some content of it, if the Launcher app is the focused window.
• [C-2-3] MUST honor the declared AndroidManifestLayout_minWidth and AndroidManifestLayout_minHeight values of the third-party launcher application and not override these values in the course of showing some content of the docked activity.

If device implementations support multi-window mode(s) and picture-in-picture multi-window mode, they:

• [C-3-1] MUST launch activities in picture-in-picture multi-window mode when the app is: * Targeting API level 26 or higher and declares android:supportsPictureInPicture * Targeting API level 25 or lower and declares both android:resizeableActivity and android:supportsPictureInPicture .
• [C-3-2] MUST expose the actions in their SystemUI as specified by the current PIP activity through the setActions() API.
• [C-3-3] MUST support aspect ratios greater than or equal to 1:2.39 and less than or equal to 2.39:1, as specified by the PIP activity through the setAspectRatio() API.
• [C-3-4] MUST use KeyEvent.KEYCODE_WINDOW to control the PIP window; if PIP mode is not implemented, the key MUST be available to the foreground activity.
• [C-3-5] MUST provide a user affordance to block an app from displaying in PIP mode; the AOSP implementation meets this requirement by having controls in the notification shade.

• [C-3-6] MUST allocate the following minimum width and height for the PIP window when an application does not declare any value for AndroidManifestLayout_minWidth and AndroidManifestLayout_minHeight :

  • Devices with the Configuration.uiMode that is set other than UI_MODE_TYPE_TELEVISION MUST allocate a minimum width and height of 108 dp.
  • Devices with the Configuration.uiMode that is set to UI_MODE_TYPE_TELEVISION MUST allocate a minimum width of 240 dp and a minimum height of 135 dp.

3.8.15. نمایش برش

Android supports a Display Cutout as described in the SDK document. The DisplayCutout API defines an area on the edge of the display that may not be functional for an application due to a display cutout or curved display on the edge(s).

If device implementations include display cutout(s), they:

• [C-1-5] MUST NOT have cutout(s) if the device's aspect ratio is 1.0(1:1).
• [C-1-2] MUST NOT have more than one cutout per edge.
• [C-1-3] MUST honor the display cutout flags set by the app through the WindowManager.LayoutParams API as described in the SDK.
• [C-1-4] MUST report correct values for all cutout metrics defined in the DisplayCutout API.

3.8.16. کنترل های دستگاه

Android includes ControlsProviderService and Control APIs to allow third-party applications to publish device controls for quick status and action for users.

See Section 2_2_3 for device-specific requirements.

3.8.17. کلیپ بورد

پیاده سازی دستگاه:

• [C-0-1] نباید داده‌های کلیپ‌بورد را به هیچ مؤلفه، فعالیت، سرویس، یا از طریق هر اتصال شبکه، بدون اقدام صریح کاربر (مثلاً فشار دادن دکمه‌ای روی هم‌پوشانی) یا نشان دادن محتوای ارسال‌شده، به جز برای سرویس‌ها ارسال کند. mentioned in 9.8.6 Content Capture and App Search .

If device implementations generate a user-visible preview when content is copied to the clipboard for any ClipData item where ClipData.getDescription().getExtras() contains android.content.extra.IS_SENSITIVE , they:

• [C-1-1] MUST redact the user visible preview

The AOSP reference implementation satisfies these clipboard requirements.

3.9. مدیریت دستگاه

Android includes features that allow security-aware applications to perform device administration functions at the system level, such as enforcing password policies or performing remote wipe, through the Android Device Administration API .

If device implementations implement the full range of device administration policies defined in the Android SDK documentation, they:

• [C-1-1] MUST declare android.software.device_admin .
• [C-1-2] MUST support device owner provisioning as described in section 3.9.1 and section 3.9.1.1 .

3.9.1 Device Provisioning

3.9.1.1 Device owner provisioning

If device implementations declare android.software.device_admin , they:

• [C-1-1] MUST support enrolling a Device Policy Client (DPC) as a Device Owner app as described below:
  • When the device implementation has neither users nor user data configured, it:
    • [C-1-5] MUST enroll the DPC application as the Device Owner app or enable the DPC app to choose whether to become a Device Owner or a Profile Owner, if the device declares Near-Field Communications (NFC) support via the feature flag android.hardware.nfc and receives an NFC message containing a record with MIME type MIME_TYPE_PROVISIONING_NFC .
    • [C-1-8] MUST send the ACTION_GET_PROVISIONING_MODE intent after device owner provisioning is triggered so that the DPC app can choose whether to become a Device Owner or a Profile Owner, depending on the values of android.app.extra.PROVISIONING_ALLOWED_PROVISIONING_MODES , unless it can be determined from context that there is only one valid option.
    • [C-1-9] MUST send the ACTION_ADMIN_POLICY_COMPLIANCE intent to the Device Owner app if a Device Owner is established during provisioning regardless of the provisioning method used. The user must not be able to proceed in the Setup Wizard until the Device Owner app finishes.
  • When the device implementation has users or user data, it:
    • [C-1-7] MUST not enroll any DPC application as the Device Owner App any more.
• [C-1-2] MUST show an appropriate disclosure notice (such as referenced in AOSP ) and obtain affirmative consent from the end user prior to an app being set as Device Owner, unless the device is programmatically configured for retail demo mode prior to on-screen, end-user interaction.

If device implementations declare android.software.device_admin , but also include a proprietary device management solution and provide a mechanism to promote an application configured in their solution as a "Device Owner equivalent" to the standard "Device Owner" as recognized by the standard Android DevicePolicyManager APIs, they:

• [C-2-1] MUST have a process in place to verify that the specific app being promoted belongs to a legitimate enterprise device management solution and has been configured in the proprietary solution to have the rights equivalent as a "Device Owner".
• [C-2-2] MUST show the same AOSP Device Owner consent disclosure as the flow initiated by android.app.action.PROVISION_MANAGED_DEVICE prior to enrolling the DPC application as "Device Owner".
• [C-2-3] MUST NOT hard code the consent or prevent the use of other device owner apps.

3.9.1.2 Managed profile provisioning

If device implementations declare android.software.managed_users , they:

• [C-1-1] باید API هایی را اجرا کند که به یک برنامه Device Policy Controller (DPC) اجازه می دهد تا مالک نمایه مدیریت شده جدید شود.

• [C-1-2] فرآیند تهیه نمایه مدیریت شده (جریان آغاز شده توسط DPC با استفاده از android.app.action.PROVISION_MANAGED_PROFILE ) یا توسط پلت فرم)، صفحه رضایت و تجربه کاربر باید با اجرای AOSP هماهنگ باشد.

• [C-1-3] MUST provide the following user affordances within the Settings to indicate to the user when a particular system function has been disabled by the Device Policy Controller (DPC):

  • A consistent icon or other user affordance (for example the upstream AOSP info icon) to represent when a particular setting is restricted by a Device Admin.
  • A short explanation message, as provided by the Device Admin via the setShortSupportMessage .
  • The DPC application's icon.

• [C-1-4] MUST launch the handler for ACTION_PROVISIONING_SUCCESSFUL intent in the work profile if a Profile Owner is established when provisioning is initiated by the android.app.action.PROVISION_MANAGED_PROFILE intent and the DPC has implemented the handler.

• [C-1-5] MUST send ACTION_PROFILE_PROVISIONING_COMPLETE broadcast to the work profile DPC when provisioning is initiated by the android.app.action.PROVISION_MANAGED_PROFILE intent.

• [C-1-6] MUST send the ACTION_GET_PROVISIONING_MODE intent after profile owner provisioning is triggered so that the DPC app can choose whether to become a Device Owner or a Profile Owner except when provisioning is triggered by the intent android.app.action.PROVISION_MANAGED_PROFILE .

• [C-1-7] باید هدف ACTION_ADMIN_POLICY_COMPLIANCE را به نمایه کاری ارسال کند، زمانی که مالک نمایه در حین تهیه، بدون توجه به اینکه از کدام روش تأمین استفاده می‌شود، به جز زمانی که تأمین توسط intent android.app.action.PROVISION_MANAGED_PROFILE ایجاد می‌شود، ارسال شود. The user must not be able proceed in the Setup Wizard until the Profile Owner app finishes.

• [C-1-8] MUST send ACTION_MANAGED_PROFILE_PROVISIONED broadcast to the personal profile DPC when a Profile Owner is established, regardless of the provisioning method used.

3.9.2 Managed Profile Support

If device implementations declare android.software.managed_users , they:

• [C-1-1] MUST support managed profiles via the android.app.admin.DevicePolicyManager APIs.
• [C-1-2] MUST allow one and only one managed profile to be created .
• [C-1-3] MUST use an icon badge (similar to the AOSP upstream work badge) to represent the managed applications and widgets and other badged UI elements like Recents & Notifications.
• [C-1-4] MUST display a notification icon (similar to the AOSP upstream work badge) to indicate when user is within a managed profile application.
• [C-1-5] MUST display a toast indicating that the user is in the managed profile if and when the device wakes up (ACTION_USER_PRESENT) and the foreground application is within the managed profile.
• [C-1-6] Where a managed profile exists, MUST show a visual affordance in the Intent 'Chooser' to allow the user to forward the intent from the managed profile to the primary user or vice versa, if enabled by the Device Policy کنترل کننده.
• [C-1-7] Where a managed profile exists, MUST expose the following user affordances for both the primary user and the managed profile:
  • Separate accounting for battery, location, mobile data and storage usage for the primary user and managed profile.
  • Independent management of VPN Applications installed within the primary user or managed profile.
  • Independent management of applications installed within the primary user or managed profile.
  • Independent management of accounts within the primary user or managed profile.
• [C-1-8] MUST ensure the preinstalled dialer, contacts and messaging applications can search for and look up caller information from the managed profile (if one exists) alongside those from the primary profile, if the Device Policy Controller permits it.
• [C-1-9] MUST ensure that it satisfies all the security requirements applicable for a device with multiple users enabled (see section 9.5 ), even though the managed profile is not counted as another user in addition to the primary user.

If device implementations declare android.software.managed_users and android.software.secure_lock_screen , they:

• [C-2-1] MUST support the ability to specify a separate lock screen meeting the following requirements to grant access to apps running in a managed profile only.
  • Device implementations MUST honor the DevicePolicyManager.ACTION_SET_NEW_PASSWORD intent and show an interface to configure a separate lock screen credential for the managed profile.
  • The lock screen credentials of the managed profile MUST use the same credential storage and management mechanisms as the parent profile, as documented on the Android Open Source Project Site .
  • The DPC password policies MUST apply to only the managed profile's lock screen credentials unless called upon the DevicePolicyManager instance returned by getParentProfileInstance .
• When contacts from the managed profile are displayed in the preinstalled call log, in-call UI, in-progress and missed-call notifications, contacts and messaging apps they SHOULD be badged with the same badge used to indicate managed profile applications.

3.9.3 Managed User Support

If device implementations declare android.software.managed_users , they:

• [C-1-1] MUST provide a user affordance to logout from the current user and switch back to the primary user in multiple-user session when isLogoutEnabled returns true . The user affordance MUST be accessible from the lockscreen without unlocking the device.

If device implementations declare android.software.device_admin and provide an on-device user affordance to add additional secondary Users , they:

• [C-SR-1] Are STRONGLY RECOMMENDED show the same AOSP Device Owner consent disclosures that were shown in the flow initiated by android.app.action.PROVISION_MANAGED_DEVICE , prior to allowing accounts to be added in the new secondary User, so users understand that the device is managed.

3.9.4 Device Policy Management Role Requirements

If device implementations report android.software.device_admin or android.software.managed_users , then they:

• [C-1-1] MUST support the device policy management role as defined in section 9.1 . The application that holds the device policy management role MAY be defined by setting config_devicePolicyManagement to the package name. The package name MUST be followed by : and the signing certificate unless the application is preloaded.

If a package name is not defined for config_devicePolicyManagement as described above:

• [C-2-1] Device implementations MUST support provisioning without a device policy management role holder application ( AOSP provides a reference implementation ).

If a package name is defined for config_devicePolicyManagement as described above:

• [C-3-1] The application MUST be installed on all profiles for a user .
• [C-3-2] Device implementations MAY define an application that updates the device policy management role holder before provisioning by setting config_devicePolicyManagementUpdater .

If a package name is defined for config_devicePolicyManagementUpdater as described above:

• [C-4-1] The application MUST be preinstalled on the device.
• [C-4-2] The application MUST implement an intent filter which resolves android.app.action.UPDATE_DEVICE_POLICY_MANAGEMENT_ROLE_HOLDER .

3.10. دسترسی

Android provides an accessibility layer that helps users with disabilities to navigate their devices more easily. In addition, Android provides platform APIs that enable accessibility service implementations to receive callbacks for user and system events and generate alternate feedback mechanisms, such as text-to-speech, haptic feedback, and trackball/d-pad navigation.

If device implementations support third-party accessibility services, they:

• [C-1-1] MUST provide an implementation of the Android accessibility framework as described in the accessibility APIs SDK documentation.
• [C-1-2] MUST generate accessibility events and deliver the appropriate AccessibilityEvent to all registered AccessibilityService implementations as documented in the SDK.
• [C-1-4] MUST provide a user affordance to control accessibility services that declare the AccessibilityServiceInfo.FLAG_REQUEST_ACCESSIBILITY_BUTTON . Note that for device implementations with a system navigation bar, they SHOULD allow the user to have the option for a button in the system's navigation bar to control these services.

If device implementations include preinstalled accessibility services, they:

• [C-2-1] MUST implement these preinstalled accessibility services as Direct Boot Aware apps when the data storage is encrypted with File Based Encryption (FBE).
• SHOULD provide a mechanism in the out-of-box setup flow for users to enable relevant accessibility services, as well as options to adjust the font size, display size and magnification gestures.

3.11. تبدیل متن به گفتار

Android includes APIs that allow applications to make use of text-to-speech (TTS) services and allows service providers to provide implementations of TTS services.

If device implementations reporting the feature android.hardware.audio.output, they:

• [C-1-1] MUST support the Android TTS framework APIs.

If device implementations support installation of third-party TTS engines, they:

• [C-2-1] MUST provide user affordance to allow the user to select a TTS engine for use at system level.

3.12. TV Input Framework

The Android Television Input Framework (TIF) simplifies the delivery of live content to Android Television devices. TIF provides a standard API to create input modules that control Android Television devices.

If device implementations support TIF, they:

• [C-1-1] MUST declare the platform feature android.software.live_tv .
• [C-1-2] MUST support all TIF APIs such that an application which uses these APIs and the third-party TIF-based inputs service can be installed and used on the device.

3.13. تنظیمات سریع

Android provides a Quick Settings UI component that allows quick access to frequently used or urgently needed actions.

If device implementations include a Quick Settings UI component and support third-party Quick Settings, they:

• [C-1-1] MUST allow the user to add or remove the tiles provided through the quicksettings APIs from a third-party app.
• [C-1-2] MUST NOT automatically add a tile from a third-party app directly to the Quick Settings.
• [C-1-3] MUST display all the user-added tiles from third-party apps alongside the system-provided quick setting tiles.

3.14. رابط کاربری رسانه

If device implementations include non-voice-activated applications (the Apps) that interact with third-party applications through MediaBrowser or MediaSession , the Apps:

• [C-1-2] MUST clearly display icons obtained via getIconBitmap() or getIconUri() and titles obtained via getTitle() as described in MediaDescription . May shorten titles to comply with safety regulations (eg driver distraction).

• [C-1-3] MUST show the third-party application icon whenever displaying content provided by this third-party application.

• [C-1-4] MUST allow the user to interact with the entire MediaBrowser hierarchy. MAY restrict the access to part of the hierarchy to comply with safety regulations (eg driver distraction), but MUST NOT give preferential treatment based on content or content provider.

• [C-1-5] MUST consider double tap of KEYCODE_HEADSETHOOK or KEYCODE_MEDIA_PLAY_PAUSE as KEYCODE_MEDIA_NEXT for MediaSession.Callback#onMediaButtonEvent .

3.15. برنامه های فوری

If device implementations support Instant Apps, they MUST satisfy the following requirements:

• [C-1-1] Instant Apps MUST only be granted permissions that have the android:protectionLevel set to "instant" .
• [C-1-2] Instant Apps MUST NOT interact with installed apps via implicit intents unless one of the following is true:
  • The component's intent pattern filter is exposed and has CATEGORY_BROWSABLE
  • The action is one of ACTION_SEND, ACTION_SENDTO, ACTION_SEND_MULTIPLE
  • The target is explicitly exposed with android:visibleToInstantApps
• [C-1-3] Instant Apps MUST NOT interact explicitly with installed apps unless the component is exposed via android:visibleToInstantApps.
• [C-1-4] Installed Apps MUST NOT see details about Instant Apps on the device unless the Instant App explicitly connects to the installed application.

• Device implementations MUST provide the following user affordances for interacting with Instant Apps. The AOSP meets the requirements with the default System UI, Settings, and Launcher. پیاده سازی دستگاه:

  • [C-1-5] MUST provide a user affordance to view and delete Instant Apps locally cached for each individual app package.
  • [C-1-6] MUST provide a persistent user notification that can be collapsed while an Instant App is running in the foreground. This user notification MUST include that Instant Apps do not require installation and provide a user affordance that directs the user to the application info screen in Settings. For Instant Apps launched via web intents, as defined by using an intent with action set to Intent.ACTION_VIEW and with a scheme of "http" or "https", an additional user affordance SHOULD allow the user not to launch the Instant App and launch the associated link with the configured web browser, if a browser is available on the device.
  • [C-1-7] MUST allow running Instant Apps to be accessed from the Recents function if the Recents function is available on the device.

• [C-1-8] MUST preload one or more applications or service components with an intent handler for the intents listed in the SDK here and make the intents visible for Instant Apps.

3.16. جفت شدن دستگاه همراه

Android includes support for companion device pairing to more effectively manage association with companion devices and provides the CompanionDeviceManager API for apps to access this feature.

If device implementations support the companion device pairing feature, they:

• [C-1-1] MUST declare the feature flag FEATURE_COMPANION_DEVICE_SETUP .
• [C-1-2] MUST ensure the APIs in the android.companion package is fully implemented.
• [C-1-3] MUST provide user affordances for the user to select/confirm a companion device is present and operational.

3.17. Heavyweight Apps

If device implementations declare the feature FEATURE_CANT_SAVE_STATE , then they:

• [C-1-1] MUST have only one installed app that specifies cantSaveState running in the system at a time. If the user leaves such an app without explicitly exiting it (for example by pressing home while leaving an active activity the system, instead of pressing back with no remaining active activities in the system), then device implementations MUST prioritize that app in RAM as they do for other things that are expected to remain running, such as foreground services. While such an app is in the background, the system can still apply power management features to it, such as limiting CPU and network access.
• [C-1-2] MUST provide a UI affordance to chose the app that won't participate in the normal state save/restore mechanism once the user launches a second app declared with cantSaveState attribute.
• [C-1-3] MUST NOT apply other changes in policy to apps that specify cantSaveState , such as changing CPU performance or changing scheduling prioritization.

If device implementations don't declare the feature FEATURE_CANT_SAVE_STATE , then they:

• [C-1-1] MUST ignore the cantSaveState attribute set by apps and MUST NOT change the app behavior based on that attribute.

3.18. مخاطبین

Android includes Contacts Provider APIs to allow applications to manage contact information stored on the device. Contact data that is entered directly into the device is typically synchronized with a web service, but the data MAY also only reside locally on the device. Contacts that are only stored on the device are referred to as local contacts.

RawContacts are "associated with" or "stored in" an Account when the ACCOUNT_NAME , and ACCOUNT_TYPE , columns for the raw contacts match the corresponding Account.name and Account.type fields of the account.

Default local account : an account for raw contacts that are only stored on the device and not associated with an Account in the AccountManager , which are created with null values for the ACCOUNT_NAME , and ACCOUNT_TYPE , columns.

Custom local account : an account for raw contacts that are only stored on the device and not associated with an Account in the AccountManager, which are created with at least one non-null value for the ACCOUNT_NAME , and ACCOUNT_TYPE , columns.

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to not create custom local accounts .

If device implementations use a custom local account :

• [C-1-1] The ACCOUNT_NAME , of the custom local account MUST be returned by ContactsContract.RawContacts.getLocalAccountName
• [C-1-2] The ACCOUNT_TYPE , of the custom local account MUST be returned by ContactsContract.RawContacts.getLocalAccountType
• [C-1-3] Raw contacts that are inserted by third party applications with the default local account (ie by setting null values for ACCOUNT_NAME and ACCOUNT_TYPE ) MUST be inserted to the custom local account .
• [C-1-4] Raw contacts inserted into the custom local account MUST not be removed when accounts are added or removed.
• [C-1-5] Delete operations performed against the custom local account MUST result in raw contacts being purged immediately (as if the CALLER_IS_SYNCADAPTER param was set to true), even if the CALLER\_IS\_SYNCADAPTER param was set to false or not مشخص شده است.

4. Application Packaging Compatibility

Devices implementations:

• [C-0-1] MUST be capable of installing and running Android “.apk” files as generated by the “aapt” tool included in the official Android SDK .

  • As the above requirement may be challenging, device implementations are RECOMMENDED to use the AOSP reference implementation's package management system.

• [C-0-2] MUST support verifying “.apk” files using the APK Signature Scheme v3.1, APK Signature Scheme v3 , APK Signature Scheme v2 and JAR signing .

• [C-0-3] MUST NOT extend either the .apk , Android Manifest , Dalvik bytecode , or RenderScript bytecode formats in such a way that would prevent those files from installing and running correctly on other compatible devices.

• [C-0-4] MUST NOT allow apps other than the current "installer of record" for the package to silently uninstall the app without any user confirmation, as documented in the SDK for the DELETE_PACKAGE permission. The only exceptions are the system package verifier app handling PACKAGE_NEEDS_VERIFICATION intent and the storage manager app handling ACTION_MANAGE_STORAGE intent.

• [C-0-5] MUST have an activity that handles the android.settings.MANAGE_UNKNOWN_APP_SOURCES intent.

• [C-0-6] MUST NOT install application packages from unknown sources, unless the app that requests the installation meets all the following requirements:

  • It MUST declare the REQUEST_INSTALL_PACKAGES permission or have the android:targetSdkVersion set at 24 or lower.
  • It MUST have been granted permission by the user to install apps from unknown sources.

• SHOULD provide a user affordance to grant/revoke the permission to install apps from unknown sources per application, but MAY choose to implement this as a no-op and return RESULT_CANCELED for startActivityForResult() , if the device implementation does not want to allow users to have this choice. However, even in such cases, they SHOULD indicate to the user why there is no such choice presented.

• [C-0-7] MUST display a warning dialog with the warning string that is provided through the system API PackageManager.setHarmfulAppWarning to the user before launching an activity in an application that has been marked by the same system API PackageManager.setHarmfulAppWarning as potentially مضر

• SHOULD provide a user affordance to choose to uninstall or launch an application on the warning dialog.

• [C-0-8] MUST implement support for Incremental File System as documented here .

• [C-0-9] MUST support verifying .apk files using the APK Signature Scheme v4 and APK Signature Scheme v4.1.

5. سازگاری چند رسانه ای

پیاده سازی دستگاه:

• [C-0-1] MUST support the media formats, encoders, decoders, file types, and container formats defined in section 5.1 for each and every codec declared by MediaCodecList .
• [C-0-2] MUST declare and report support of the encoders, decoders available to third-party applications via MediaCodecList .
• [C-0-3] MUST be able to properly decode and make available to third-party apps all the formats it can encode. This includes all bitstreams that its encoders generate and the profiles reported in its CamcorderProfile .

پیاده سازی دستگاه:

• SHOULD aim for minimum codec latency, in others words, they
  • SHOULD NOT consume and store input buffers and return input buffers only once processed.
  • SHOULD NOT hold onto decoded buffers for longer than as specified by the standard (eg SPS).
  • SHOULD NOT hold onto encoded buffers longer than required by the GOP structure.

All of the codecs listed in the section below are provided as software implementations in the preferred Android implementation from the Android Open Source Project.

Please note that neither Google nor the Open Handset Alliance make any representation that these codecs are free from third-party patents. Those intending to use this source code in hardware or software products are advised that implementations of this code, including in open source software or shareware, may require patent licenses from the relevant patent holders.

5.1. Media Codecs

5.1.1. رمزگذاری صدا

See more details in 5.1.3. Audio Codecs Details .

If device implementations declare android.hardware.microphone , they MUST support encoding the following audio formats and make them available to third-party apps:

• [C-1-1] PCM/WAVE
• [C-1-2] FLAC
• [C-1-3] Opus

All audio encoders MUST support:

• [C-3-1] PCM 16-bit native byte order audio frames via the android.media.MediaCodec API.

5.1.2. Audio Decoding

See more details in 5.1.3. Audio Codecs Details .

If device implementations declare support for the android.hardware.audio.output feature, they must support decoding the following audio formats:

• [C-1-1] MPEG-4 AAC Profile (AAC LC)
• [C-1-2] MPEG-4 HE AAC Profile (AAC+)
• [C-1-3] MPEG-4 HE AACv2 Profile (enhanced AAC+)
• [C-1-4] AAC ELD (enhanced low delay AAC)
• [C-1-11] xHE-AAC (ISO/IEC 23003-3 Extended HE AAC Profile, which includes the USAC Baseline Profile, and ISO/IEC 23003-4 Dynamic Range Control Profile)
• [C-1-5] FLAC
• [C-1-6] MP3
• [C-1-7] MIDI
• [C-1-8] Vorbis
• [C-1-9] PCM/WAVE including high-resolution audio formats up to 24 bits, 192 kHz sample rate, and 8 channels. Note that this requirement is for decoding only, and that a device is permitted to downsample and downmix during the playback phase.
• [C-1-10] Opus

If device implementations support the decoding of AAC input buffers of multichannel streams (ie more than two channels) to PCM through the default AAC audio decoder in the android.media.MediaCodec API, the following MUST be supported:

• [C-2-1] Decoding MUST be performed without downmixing (eg a 5.0 AAC stream must be decoded to five channels of PCM, a 5.1 AAC stream must be decoded to six channels of PCM).
• [C-2-2] Dynamic range metadata MUST be as defined in "Dynamic Range Control (DRC)" in ISO/IEC 14496-3, and the android.media.MediaFormat DRC keys to configure the dynamic range-related behaviors of the audio decoder. The AAC DRC keys were introduced in API 21, and are: KEY_AAC_DRC_ATTENUATION_FACTOR , KEY_AAC_DRC_BOOST_FACTOR , KEY_AAC_DRC_HEAVY_COMPRESSION , KEY_AAC_DRC_TARGET_REFERENCE_LEVEL and KEY_AAC_ENCODED_TARGET_LEVEL .
• [C-SR-1] It is STRONGLY RECOMMENDED that requirements C-2-1 and C-2-2 above are satisfied by all AAC audio decoders.

When decoding USAC audio, MPEG-D (ISO/IEC 23003-4):

• [C-3-1] Loudness and DRC metadata MUST be interpreted and applied according to MPEG-D DRC Dynamic Range Control Profile Level 1.
• [C-3-2] The decoder MUST behave according to the configuration set with the following android.media.MediaFormat keys: KEY_AAC_DRC_TARGET_REFERENCE_LEVEL and KEY_AAC_DRC_EFFECT_TYPE .

MPEG-4 AAC, HE AAC, and HE AACv2 profile decoders:

• MAY support loudness and dynamic range control using ISO/IEC 23003-4 Dynamic Range Control Profile.

If ISO/IEC 23003-4 is supported and if both ISO/IEC 23003-4 and ISO/IEC 14496-3 metadata are present in a decoded bitstream, then:

• ISO/IEC 23003-4 metadata SHALL take precedence.

All audio decoders MUST support outputting:

• [C-6-1] PCM 16-bit native byte order audio frames via the android.media.MediaCodec API.

If device implementations support the decoding of AAC input buffers of multichannel streams (ie more than two channels) to PCM through the default AAC audio decoder in the android.media.MediaCodec API, then the following MUST be supported:

• [C-7-1] MUST be able to be configured by the application using the decoding with the key KEY_MAX_OUTPUT_CHANNEL_COUNT to control whether the content is downmixed to stereo (when using a value of 2) or is output using the native number of channels (when using a value equal or greater to that number). For instance a value of 6 or greater would configure a decoder to output 6 channels when fed 5.1 content.
• [C-7-2] When decoding, the decoder MUST advertise the channel mask being used on the output format with the KEY_CHANNEL_MASK key, using the android.media.AudioFormat constants (example: CHANNEL_OUT_5POINT1 ).

If device implementations support audio decoders other than the default AAC audio decoder and are capable of outputting multi-channel audio (ie more than 2 channels) when fed compressed multi-channel content, then:

• [C-SR-2] The decoder is STRONGLY RECOMMENDED to be able to be configured by the application using the decoding with the key KEY_MAX_OUTPUT_CHANNEL_COUNT to control whether the content is downmixed to stereo (when using a value of 2) or is output using the native number of channels (when using a value equal or greater to that number). For instance a value of 6 or greater would configure a decoder to output 6 channels when fed 5.1 content.
• [C-SR-3] When decoding, the decoder is STRONGLY RECOMMENDED to advertise the channel mask being used on the output format with the KEY_CHANNEL_MASK key, using the android.media.AudioFormat constants (example: CHANNEL_OUT_5POINT1 ).

5.1.3. Audio Codecs Details

5.1.4. Image Encoding

See more details in 5.1.6. Image Codecs Details .

Device implementations MUST support encoding the following image encoding:

• [C-0-1] JPEG
• [C-0-2] PNG
• [C-0-3] WebP

If device implementations support HEIC encoding via android.media.MediaCodec for media type MIMETYPE_IMAGE_ANDROID_HEIC , they:

• [C-1-1] MUST provide a hardware-accelerated HEVC encoder codec that supports BITRATE_MODE_CQ bitrate control mode, HEVCProfileMainStill profile and 512 x 512 px frame size.

5.1.5. Image Decoding

See more details in 5.1.6. Image Codecs Details .

Device implementations MUST support decoding the following image encoding:

• [C-0-1] JPEG
• [C-0-2] GIF
• [C-0-3] PNG
• [C-0-4] BMP
• [C-0-5] WebP
• [C-0-6] Raw

If device implementations support HEVC video decoding, they: * [C-1-1] MUST support HEIF (HEIC) image decoding.

Image decoders that support a high bit-depth format (9+ bits per channel):

• [C-2-1] MUST support outputting an 8-bit equivalent format if requested by the application, for example, via the ARGB_8888 config of android.graphics.Bitmap .

5.1.6. Image Codecs Details

Image encoder and decoders exposed through the MediaCodec API

• [C-1-1] MUST support YUV420 8:8:8 flexible color format ( COLOR_FormatYUV420Flexible ) through CodecCapabilities .

• [C-SR-1] STRONGLY RECOMMENDED to support RGB888 color format for input Surface mode.

• [C-1-3] MUST support at least one of a planar or semiplanar YUV420 8:8:8 color format: COLOR_FormatYUV420PackedPlanar (equivalent to COLOR_FormatYUV420Planar ) or COLOR_FormatYUV420PackedSemiPlanar (equivalent to COLOR_FormatYUV420SemiPlanar ). They are STRONGLY RECOMMENDED to support both.

5.1.7. کدک های ویدیویی

• For acceptable quality of web video streaming and video-conference services, device implementations SHOULD use a hardware VP8 codec that meets the requirements .

If device implementations include a video decoder or encoder:

• [C-1-1] Video codecs MUST support output and input bytebuffer sizes that accommodate the largest feasible compressed and uncompressed frame as dictated by the standard and configuration but also not overallocate.

• [C-1-2] Video encoders and decoders MUST support YUV420 8:8:8 flexible color formats ( COLOR_FormatYUV420Flexible ) through CodecCapabilities .

• [C-1-3] Video encoders and decoders MUST support at least one of a planar or semiplanar YUV420 8:8:8 color format: COLOR_FormatYUV420PackedPlanar (equivalent to COLOR_FormatYUV420Planar ) or COLOR_FormatYUV420PackedSemiPlanar (equivalent to COLOR_FormatYUV420SemiPlanar ). They are STRONGLY RECOMMENDED to support both.

• [C-SR-1] Video encoders and decoders are STRONGLY RECOMMENDED to support at least one of a hardware optimized planar or semiplanar YUV420 8:8:8 color format (YV12, NV12, NV21 or equivalent vendor optimized format.)

• [C-1-5] Video decoders that support a high bit-depth format (9+ bits per channel) MUST support outputting an 8-bit equivalent format if requested by the application. This MUST be reflected by supporting an YUV420 8:8:8 color format via android.media.MediaCodecInfo .

If device implementations advertise HDR profile support through Display.HdrCapabilities , they:

• [C-2-1] MUST support HDR static metadata parsing and handling.

If device implementations advertise intra refresh support through FEATURE_IntraRefresh in the MediaCodecInfo.CodecCapabilities class, they:

• [C-3-1] MUST support the refresh periods in the range of 10 - 60 frames and accurately operate within 20% of configured refresh period.

Unless the application specifies otherwise using the KEY_COLOR_FORMAT format key, video decoder implementations:

• [C-4-1] MUST default to the color format optimized for hardware display if configured using Surface output.
• [C-4-2] MUST default to a YUV420 8:8:8 color format optimized for CPU reading if configured to not use Surface output.

5.1.8. Video Codecs List

5.1.9. Media Codec Security

Device implementations MUST ensure compliance with media codec security features as described below.

Android includes support for OMX, a cross-platform multimedia acceleration API, as well as Codec 2.0, a low-overhead multimedia acceleration API.

If device implementations support multimedia, they:

• [C-1-1] MUST provide support for media codecs either via OMX or Codec 2.0 APIs (or both) as in the Android Open Source Project and not disable or circumvent the security protections. This specifically does not mean that every codec MUST use either the OMX or Codec 2.0 API, only that support for at least one of these APIs MUST be available, and support for the available APIs MUST include the security protections present.
• [C-SR-1] Are STRONGLY RECOMMENDED to include support for Codec 2.0 API.

If device implementations do not support the Codec 2.0 API, they:

• [C-2-1] باید کدک نرم افزار OMX مربوطه را از پروژه منبع باز Android (در صورت موجود بودن) برای هر قالب و نوع رسانه (رمزگذار یا رمزگشا) پشتیبانی شده توسط دستگاه شامل شود.
• [C-2-2] Codecs that have names starting with "OMX.google." MUST be based on their Android Open Source Project source code.
• [C-SR-2] Are STRONGLY RECOMMENDED that the OMX software codecs run in a codec process that does not have access to hardware drivers other than memory mappers.

If device implementations support Codec 2.0 API, they:

• [C-3-1] باید کدک نرم افزار Codec 2.0 مربوطه را از پروژه منبع باز Android (در صورت موجود بودن) برای هر قالب و نوع رسانه (رمزگذار یا رمزگشا) پشتیبانی شده توسط دستگاه داشته باشد.
• [C-3-2] MUST house the Codec 2.0 software codecs in the software codec process as provided in the Android Open Source Project to make it possible to more narrowly grant access to software codecs.
• [C-3-3] کدک‌هایی که نامشان با «c2.android» شروع می‌شود. MUST be based on their Android Open Source Project source code.

5.1.10. Media Codec Characterization

If device implementations support media codecs, they:

• [C-1-1] MUST return correct values of media codec characterization via the MediaCodecInfo API.

به طور خاص:

• [C-1-2] Codecs with names starting with "OMX." باید از APIهای OMX استفاده کند و نام‌هایی داشته باشد که با دستورالعمل‌های نام‌گذاری OMX IL مطابقت داشته باشد.
• [C-1-3] Codecs with names starting with "c2." MUST use the Codec 2.0 API and have names that conform to Codec 2.0 naming guidelines for Android.
• [C-1-4] Codecs with names starting with "OMX.google." or "c2.android." MUST NOT be characterized as vendor or as hardware-accelerated.
• [C-1-5] Codecs that run in a codec process (vendor or system) that have access to hardware drivers other than memory allocators and mappers MUST NOT be characterized as software-only.
• [C-1-6] Codecs not present in the Android Open Source Project or not based on the source code in that project MUST be characterized as vendor.
• [C-1-7] Codecs that utilize hardware acceleration MUST be characterized as hardware accelerated.
• [C-1-8] Codec names MUST NOT be misleading. For example, codecs named "decoders" MUST support decoding, and those named "encoders" MUST support encoding. Codecs with names containing media formats MUST support those formats.

If device implementations support video codecs:

• [C-2-1] All video codecs MUST publish achievable frame rate data for the following sizes if supported by the codec:

• [C-2-2] Video codecs that are characterized as hardware accelerated MUST publish performance points information. They MUST each list all supported standard performance points (listed in PerformancePoint API), unless they are covered by another supported standard performance point.
• Additionally they SHOULD publish extended performance points if they support sustained video performance other than one of the standard ones listed.

5.2. رمزگذاری ویدیو

If device implementations support any video encoder and make it available to third-party apps, they:

• SHOULD NOT be, over two sliding windows, more than 15% over the bitrate between intraframe (I-frame) intervals.
• SHOULD NOT be more than 100% over the bitrate over a sliding window of 1 second.

If device implementations include an embedded screen display with the diagonal length of at least 2.5 inches or include a video output port or declare the support of a camera via the android.hardware.camera.any feature flag, they:

• [C-1-1] MUST include the support of at least one of the VP8 or H.264 video encoders, and make it available for third-party applications.
• SHOULD support both VP8 and H.264 video encoders, and make it available for third-party applications.

If device implementations support any of the H.264, VP8, VP9 or HEVC video encoders and make it available to third-party applications, they:

• [C-2-1] MUST support dynamically configurable bitrates.
• SHOULD support variable frame rates, where video encoder SHOULD determine instantaneous frame duration based on the timestamps of input buffers, and allocate its bit bucket based on that frame duration.

If device implementations support the MPEG-4 SP video encoder and make it available to third-party apps, they:

• SHOULD support dynamically configurable bitrates for the supported encoder.

If device implementations provide hardware accelerated video or image encoders, and support one or more attached or pluggable hardware camera(s) exposed through the android.camera APIs:

• [C-4-1] all hardware accelerated video and image encoders MUST support encoding frames from the hardware camera(s).
• SHOULD support encoding frames from the hardware camera(s) through all video or image encoders.

If device implementations provide HDR encoding, they:

• [C-SR-1] are STRONGLY RECOMMENDED to provide a plugin for the seamless transcoding API to convert from HDR format to SDR format.

5.2.1. H.263

If device implementations support H.263 encoders and make it available to third-party apps, they:

• [C-1-1] MUST support Baseline Profile Level 45.
• SHOULD support dynamically configurable bitrates for the supported encoder.

5.2.2. H.264

If device implementations support H.264 codec, they:

• [C-1-1] MUST support Baseline Profile Level 3. However, support for ASO (Arbitrary Slice Ordering), FMO (Flexible Macroblock Ordering) and RS (Redundant Slices) is OPTIONAL. Moreover, to maintain compatibility with other Android devices, it is RECOMMENDED that ASO, FMO and RS are not used for Baseline Profile by encoders.
• [C-1-2] MUST support the SD (Standard Definition) video encoding profiles in the following table.
• SHOULD support Main Profile Level 4.
• SHOULD support the HD (High Definition) video encoding profiles as indicated in the following table.

If device implementations report support of H.264 encoding for 720p or 1080p resolution videos through the media APIs, they:

• [C-2-1] MUST support the encoding profiles in the following table.

5.2.3. VP8

If device implementations support VP8 codec, they:

• [C-1-1] MUST support the SD video encoding profiles.
• SHOULD support the following HD (High Definition) video encoding profiles.
• [C-1-2] MUST support writing Matroska WebM files.
• SHOULD provide a hardware VP8 codec that meets the WebM project RTC hardware coding requirements , to ensure acceptable quality of web video streaming and video-conference services.

If device implementations report support of VP8 encoding for 720p or 1080p resolution videos through the media APIs, they:

• [C-2-1] MUST support the encoding profiles in the following table.

5.2.4. VP9

If device implementations support VP9 codec, they:

• [C-1-2] MUST support Profile 0 Level 3.
• [C-1-1] MUST support writing Matroska WebM files.
• [C-1-3] MUST generate CodecPrivate data.
• SHOULD support the HD decoding profiles as indicated in the following table.
• [C-SR-1] are STRONGLY RECOMMENDED to support the HD decoding profiles as indicated in the following table if there is a hardware encoder.

If device implementations claim to support Profile 2 or Profile 3 through the Media APIs:

• Support for 12-bit format is OPTIONAL.

5.2.5. H.265

If device implementations support H.265 codec, they:

• [C-1-1] MUST support Main Profile Level 3.
• SHOULD support the HD encoding profiles as indicated in the following table.
• [C-SR-1] are STRONGLY RECOMMENDED to support the HD encoding profiles as indicated in the following table if there is a hardware encoder.

5.3. Video Decoding

If device implementations support VP8, VP9, H.264, or H.265 codecs, they:

• [C-1-1] MUST support dynamic video resolution and frame rate switching through the standard Android APIs within the same stream for all VP8, VP9, H.264, and H.265 codecs in real time and up to the maximum resolution supported by each codec on the device.

5.3.1. MPEG-2

If device implementations support MPEG-2 decoders, they:

• [C-1-1] MUST support the Main Profile High Level.

5.3.2. H.263

If device implementations support H.263 decoders, they:

• [C-1-1] MUST support Baseline Profile Level 30 and Level 45.

5.3.3. MPEG-4

If device implementations with MPEG-4 decoders, they:

• [C-1-1] باید از نمایه ساده سطح 3 پشتیبانی کند.

5.3.4. H.264

If device implementations support H.264 decoders, they:

• [C-1-1] MUST support Main Profile Level 3.1 and Baseline Profile. Support for ASO (Arbitrary Slice Ordering), FMO (Flexible Macroblock Ordering) and RS (Redundant Slices) is OPTIONAL.
• [C-1-2] MUST be capable of decoding videos with the SD (Standard Definition) profiles listed in the following table and encoded with the Baseline Profile and Main Profile Level 3.1 (including 720p30).
• همانطور که در جدول زیر نشان داده شده است، باید قادر به رمزگشایی ویدیوها با نمایه های HD (با وضوح بالا) باشد.

If the height that is reported by the Display.getSupportedModes() method is equal or greater than the video resolution, device implementations:

• [C-2-1] MUST support the HD 720p video decoding profiles in the following table.
• [C-2-2] MUST support the HD 1080p video decoding profiles in the following table.

5.3.5. H.265 (HEVC)

If device implementations support H.265 codec, they:

• [C-1-1] MUST support the Main Profile Level 3 Main tier and the SD video decoding profiles as indicated in the following table.
• SHOULD support the HD decoding profiles as indicated in the following table.
• [C-1-2] MUST support the HD decoding profiles as indicated in the following table if there is a hardware decoder.

If the height that is reported by the Display.getSupportedModes() method is equal to or greater than the video resolution, then:

• [C-2-1] Device implementations MUST support at least one of H.265 or VP9 decoding of 720, 1080 and UHD profiles.

If device implementations claim to support an HDR Profile through the Media APIs:

• [C-3-1] Device implementations MUST accept the required HDR metadata from the application, as well as support extracting and outputting the required HDR metadata from the bitstream and/or container.
• [C-3-2] Device implementations MUST properly display HDR content on the device screen or on a standard video output port (eg, HDMI).

5.3.6. VP8

If device implementations support VP8 codec, they:

• [C-1-1] MUST support the SD decoding profiles in the following table.
• باید از کدک VP8 سخت افزاری استفاده کرد که شرایط را برآورده کند.
• SHOULD support the HD decoding profiles in the following table.

If the height as reported by the Display.getSupportedModes() method is equal or greater than the video resolution, then:

• [C-2-1] Device implementations MUST support 720p profiles in the following table.
• [C-2-2] Device implementations MUST support 1080p profiles in the following table.

5.3.7. VP9

If device implementations support VP9 codec, they:

• [C-1-1] MUST support the SD video decoding profiles as indicated in the following table.
• SHOULD support the HD decoding profiles as indicated in the following table.

If device implementations support VP9 codec and a hardware decoder:

• [C-2-1] MUST support the HD decoding profiles as indicated in the following table.

If the height that is reported by the Display.getSupportedModes() method is equal to or greater than the video resolution, then:

• [C-3-1] Device implementations MUST support at least one of VP9 or H.265 decoding of the 720, 1080 and UHD profiles.

If device implementations claim to support VP9Profile2 or VP9Profile3 through the 'CodecProfileLevel' media APIs:

• Support for 12-bit format is OPTIONAL.

If device implementations claim to support an HDR Profile ( VP9Profile2HDR , VP9Profile2HDR10Plus , VP9Profile3HDR , VP9Profile3HDR10Plus ) through the media APIs:

• [C-4-1] Device implementations MUST accept the required HDR metadata ( KEY_HDR_STATIC_INFO for all HDR profiles, as well as 'KEY_HDR10_PLUS_INFO' for HDR10Plus profiles) from the application. They also MUST support extracting and outputting the required HDR metadata from the bitstream and/or container.
• [C-4-2] Device implementations MUST properly display HDR content on the device screen or on a standard video output port (eg, HDMI).

5.3.8. دالبی ویژن

If device implementations declare support for the Dolby Vision decoder through HDR_TYPE_DOLBY_VISION , they:

• [C-1-1] MUST provide a Dolby Vision-capable extractor.
• [C-1-2] MUST properly display Dolby Vision content on the device screen or on a standard video output port (eg, HDMI).
• [C-1-3] MUST set the track ID of backward-compatible base-layer(s) (if present) to be the same as the combined Dolby Vision layer's track ID.

5.3.9. AV1

If device implementations support AV1 codec, they:

• [C-1-1] MUST support Profile 0 including 10-bit content.

5.4. ضبط صدا

While some of the requirements outlined in this section are listed as SHOULD since Android 4.3, the Compatibility Definition for future versions are planned to change these to MUST. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements that are listed as SHOULD, or they will not be able to attain Android compatibility when upgraded to the future version.

5.4.1. Raw Audio Capture and Microphone Information

If device implementations declare android.hardware.microphone , they:

• [C-1-1] MUST allow capture of raw audio content for any AudioRecord or AAudio INPUT stream that is opened successfully. At a minimum, the following characteristics MUST be supported:

  • Format: Linear PCM, 16-bit
  • Sampling rates: 8000, 11025, 16000, 44100, 48000 Hz
  • Channels: Mono
  • Audio Sources: DEFAULT , MIC , CAMCORDER , VOICE_RECOGNITION , VOICE_COMMUNICATION , UNPROCESSED , or VOICE_PERFORMANCE . This also applies to the equivalent Input Presets in AAudio , for example, AAUDIO_INPUT_PRESET_CAMCORDER .

• SHOULD allow capture of raw audio content with the following characteristics:

  • Format : Linear PCM, 16-bit and 24-bit
  • Sampling rates : 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000 Hz
  • Channels : As many channels as the number of microphones on the device

• [C-1-2] MUST capture at above sample rates without up-sampling.

• [C-1-3] MUST include an appropriate anti-aliasing filter when the sample rates given above are captured with down-sampling.

• SHOULD allow AM radio and DVD quality capture of raw audio content, which means the following characteristics:

  • Format : Linear PCM, 16-bit
  • Sampling rates : 22050, 48000 Hz
  • Channels : Stereo

• [C-1-4] MUST honor the MicrophoneInfo API and properly fill in information for the available microphones on device accessible to the third-party applications via the AudioManager.getMicrophones() API, for active AudioRecord using MediaRecorder.AudioSources DEFAULT , MIC , CAMCORDER , VOICE_RECOGNITION , VOICE_COMMUNICATION , UNPROCESSED , or VOICE_PERFORMANCE .

If device implementations allow AM radio and DVD quality capture of raw audio content, they:

• [C-2-1] MUST capture without up-sampling at any ratio higher than 16000:22050 or 44100:48000.
• [C-2-2] MUST include an appropriate anti-aliasing filter for any up-sampling or down-sampling.

5.4.2. Capture for Voice Recognition

If device implementations declare android.hardware.microphone , they:

• [C-1-1] MUST capture android.media.MediaRecorder.AudioSource.VOICE_RECOGNITION audio source at one of the sampling rates, 44100 and 48000.
• [C-1-2] MUST, by default, disable any noise reduction audio processing when recording an audio stream from the AudioSource.VOICE_RECOGNITION audio source.

• [C-1-3] MUST, by default, disable any automatic gain control when recording an audio stream from the AudioSource.VOICE_RECOGNITION audio source.

• SHOULD exhibit approximately flat amplitude-versus-frequency characteristics in the mid-frequency range: specifically ±3dB from 100 Hz to 4000 Hz for each and every microphone used to record the voice recognition audio source.

• [C-SR-1] are STRONGLY RECOMMENDED to exhibit amplitude levels in the low frequency range: specifically from ±20 dB from 30 Hz to 100 Hz compared to the mid-frequency range for each and every microphone used to record the voice recognition audio منبع

• [C-SR-2] are STRONGLY RECOMMENDED to exhibit amplitude levels in the high frequency range: specifically from ±30 dB from 4000 Hz to 22 KHz compared to the mid-frequency range for each and every microphone used to record the voice recognition audio منبع

• SHOULD set audio input sensitivity such that a 1000 Hz sinusoidal tone source played at 90 dB Sound Pressure Level (SPL) (measured next to the microphone) yields an ideal response of RMS 2500 within a range of 1770 and 3530 for 16 bit-samples (or -22.35 db ±3dB Full Scale for floating point/double precision samples) for each and every microphone used to record the voice recognition audio source.

• SHOULD record the voice recognition audio stream so that the PCM amplitude levels linearly track input SPL changes over at least a 30 dB range from -18 dB to +12 dB re 90 dB SPL at the microphone.

• SHOULD record the voice recognition audio stream with total harmonic distortion (THD) less than 1% for 1 kHz at 90 dB SPL input level at the microphone.

If device implementations declare android.hardware.microphone and noise suppression (reduction) technologies tuned for speech recognition, they:

• [C-2-1] MUST allow this audio effect to be controllable with the android.media.audiofx.NoiseSuppressor API.
• [C-2-2] MUST uniquely identify each noise suppression technology implementation via the AudioEffect.Descriptor.uuid field.

5.4.3. Capture for Rerouting of Playback

The android.media.MediaRecorder.AudioSource class includes the REMOTE_SUBMIX audio source.

If device implementations declare both android.hardware.audio.output and android.hardware.microphone , they:

• [C-1-1] MUST properly implement the REMOTE_SUBMIX audio source so that when an application uses the android.media.AudioRecord API to record from this audio source, it captures a mix of all audio streams except for the following:

  • AudioManager.STREAM_RING
  • AudioManager.STREAM_ALARM
  • AudioManager.STREAM_NOTIFICATION

5.4.4. Acoustic Echo Canceler

If device implementations declare android.hardware.microphone , they:

• SHOULD implement an Acoustic Echo Canceler (AEC) technology tuned for voice communication and applied to the capture path when capturing using AudioSource.VOICE_COMMUNICATION .

If device implementations provides an Acoustic Echo Canceler which is inserted in the capture audio path when AudioSource.VOICE_COMMUNICATION is selected, they:

• [C-SR-1] are STRONGLY_RECOMMENDED to declare this via AcousticEchoCanceler API method AcousticEchoCanceler.isAvailable()
• [C-SR-2] are STRONGLY_RECOMMENDED to allow this audio effect to be controllable with the AcousticEchoCanceler API.
• [C-SR-3] are STRONGLY_RECOMMENDED to uniquely identify each AEC technology implementation via the AudioEffect.Descriptor.uuid field.

5.4.5. Concurrent Capture

If device implementations declare android.hardware.microphone ,they MUST implement concurrent capture as described in this document . به طور مشخص:

• [C-1-1] MUST allow concurrent access to microphone by an accessibility service capturing with AudioSource.VOICE_RECOGNITION and at least one application capturing with any AudioSource .
• [C-1-2] MUST allow concurrent access to microphone by a pre-installed application that holds an Assistant role and at least one application capturing with any AudioSource except for AudioSource.VOICE_COMMUNICATION or AudioSource.CAMCORDER .
• [C-1-3] MUST silence the audio capture for any other application, except for an accessibility service, while an application is capturing with AudioSource.VOICE_COMMUNICATION or AudioSource.CAMCORDER . However, when an app is capturing via AudioSource.VOICE_COMMUNICATION then another app can capture the voice call if it is a privileged (pre-installed) app with permission CAPTURE_AUDIO_OUTPUT .
• [C-1-4] If two or more applications are capturing concurrently and if neither app has an UI on top, the one that started capture the most recently receives audio.

5.4.6. Microphone Gain Levels [Moved to 5.4.2]

5.5. پخش صدا

Android includes the support to allow apps to playback audio through the audio output peripheral as defined in section 7.8.2.

5.5.1. Raw Audio Playback

If device implementations declare android.hardware.audio.output , they:

• [C-1-1] MUST allow playback of raw audio content with the following characteristics:

  • Source formats : Linear PCM, 16-bit, 8-bit, float
  • Channels : Mono, Stereo, valid multichannel configurations with up to 8 channels
  • Sampling rates (in Hz) :
    • 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000 at the channel configurations listed above
    • 96000 in mono and stereo

5.5.2. جلوه های صوتی

Android provides an API for audio effects for device implementations.

If device implementations declare the feature android.hardware.audio.output , they:

• [C-1-1] MUST support the EFFECT_TYPE_EQUALIZER and EFFECT_TYPE_LOUDNESS_ENHANCER implementations controllable through the AudioEffect subclasses Equalizer and LoudnessEnhancer .
• [C-1-2] MUST support the visualizer API implementation, controllable through the Visualizer class.
• [C-1-3] MUST support the EFFECT_TYPE_DYNAMICS_PROCESSING implementation controllable through the AudioEffect subclass DynamicsProcessing .
• SHOULD support the EFFECT_TYPE_BASS_BOOST , EFFECT_TYPE_ENV_REVERB , EFFECT_TYPE_PRESET_REVERB , and EFFECT_TYPE_VIRTUALIZER implementations controllable through the AudioEffect sub-classes BassBoost , EnvironmentalReverb , PresetReverb , and Virtualizer .
• [C-SR-1] Are STRONGLY RECOMMENDED to support effects in floating-point and multichannel.

5.5.3. صدای خروجی صدا

پیاده سازی دستگاه خودرو:

• SHOULD allow adjusting audio volume separately per each audio stream using the content type or usage as defined by AudioAttributes and car audio usage as publicly defined in android.car.CarAudioManager .

5.5.4. Audio Offload

If device implementations support audio offload playback , they:

• [C-SR-1] Are STRONGLY RECOMMENDED to trim the played gapless audio content between two clips with the same format when specified by the AudioTrack gapless API and the media container for MediaPlayer.

5.6. تأخیر صوتی

Audio latency is the time delay as an audio signal passes through a system. Many classes of applications rely on short latencies, to achieve real-time sound effects.

For the purposes of this section, use the following definitions:

• output latency . The interval between when an application writes a frame of PCM-coded data and when the corresponding sound is presented to the environment at an on-device transducer or the signal leaves the device via a port and can be observed externally.
• cold output latency . The time between starting an output stream and the presentation time of the first frame based on timestamps, when the audio output system has been idle and powered down prior to the request.
• continuous output latency . The output latency for subsequent frames, after the device is playing audio.
• input latency . The interval between when a sound is presented by environment to device at an on-device transducer or signal enters the device via a port and when an application reads the corresponding frame of PCM-coded data.
• lost input . The initial portion of an input signal that is unusable or unavailable.
• cold input latency . The time between starting the stream and when the first valid frame is received, when the audio input system has been idle and powered down prior to the request.
• continuous input latency . The input latency for subsequent frames, while the device is capturing audio.
• continuous round-trip latency . The sum of continuous input latency plus continuous output latency plus one buffer period. The buffer period allows time for the app to process the signal and time for the app to mitigate phase difference between input and output streams.
• OpenSL ES PCM buffer queue API . The set of PCM-related OpenSL ES APIs within Android NDK .
• AAudio native audio API . The set of AAudio APIs within Android NDK .
• مهر زمان A pair consisting of a relative frame position within a stream and the estimated time when that frame enters or leaves the audio processing pipeline on the associated endpoint. See also AudioTimestamp .
• glitch . A temporary interruption or incorrect sample value in the audio signal, typically caused by a buffer underrun for output, buffer overrun for input, or any other source of digital or analog noise.
• mean absolute deviation . The average of the absolute value of the deviations from the mean for a set of values.
• tap-to-tone latency . The time between when the screen is tapped and when a tone generated as a result of that tap is heard on the speaker.

If device implementations declare android.hardware.audio.output , they MUST meet or exceed the following requirements:

• [C-1-1] The output timestamp returned by AudioTrack.getTimestamp and AAudioStream_getTimestamp is accurate to +/- 2 ms.

• [C-1-2] Cold output latency of 500 milliseconds or less.

• [C-1-3] Opening an output stream using AAudioStreamBuilder_openStream() MUST take less than 1000 milliseconds.

If device implementations declare android.hardware.audio.output they are STRONGLY RECOMMENDED to meet or exceed the following requirements:

• [C-SR-1] Cold output latency of 100 milliseconds or less over the speaker data path.

• [C-SR-2] Tap-to-tone latency of 80 milliseconds or less.

• [C-SR-4] The output timestamp returned by AudioTrack.getTimestamp and AAudioStream_getTimestamp is accurate to +/- 1 ms.

If device implementations meet the above requirements, after any initial calibration, when using the AAudio native audio API, for continuous output latency and cold output latency over at least one supported audio output device, they are:

• [C-SR-5] STRONGLY RECOMMENDED to report low-latency audio by declaring android.hardware.audio.low_latency feature flag.
• [C-SR-6] STRONGLY RECOMMENDED to meet the requirements for low-latency audio via the AAudio API.
• [C-SR-7] STRONGLY RECOMMENDED to ensure that for streams that return AAUDIO_PERFORMANCE_MODE_LOW_LATENCY from AAudioStream_getPerformanceMode() , the value returned by AAudioStream_getFramesPerBurst() is less than or equal to the value returned by android.media.AudioManager.getProperty(String) for property key AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER .

If device implementations do not meet the requirements for low-latency audio via the AAudio native audio API, they:

• [C-2-1] MUST NOT report support for low-latency audio.

If device implementations include android.hardware.microphone , they MUST meet these input audio requirements:

• [C-3-1] Limit the error in input timestamps, as returned by AudioRecord.getTimestamp or AAudioStream_getTimestamp , to +/- 2 ms. "Error" here means the deviation from the correct value.

• [C-3-2] Cold input latency of 500 milliseconds or less.

• [C-3-3] Opening an input stream using AAudioStreamBuilder_openStream() MUST take less than 1000 milliseconds.

If device implementations include android.hardware.microphone , they are STRONGLY RECOMMENDED to meet these input audio requirements:

• [C-SR-8] Cold input latency of 100 milliseconds or less over the microphone data path.

• [C-SR-11] Limit the error in input timestamps, as returned by AudioRecord.getTimestamp or AAudioStream_getTimestamp , to +/- 1 ms.

If device implementations declare android.hardware.audio.output and android.hardware.microphone , they:

• [C-SR-12] Are STRONGLY RECOMMENDED to have a Mean Continuous Round-Trip Latency of 50 milliseconds or less over 5 measurements, with a Mean Absolute Deviation less than 10 msec, over at least one supported path.

5.7. پروتکل های شبکه

Device implementations MUST support the media network protocols for audio and video playback as specified in the Android SDK documentation.

For each codec and container format that a device implementation is required to support, the device implementation:

• [C-1-1] MUST support that codec or container over HTTP and HTTPS.

• [C-1-2] MUST support the corresponding media segment formats as shown in the media segment formats table below over HTTP Live Streaming draft protocol, Version 7 .

• [C-1-3] MUST support the corresponding RTSP payload formats as shown in the RTSP table below. For exceptions please see the table footnotes in section 5.1 .

Media Segment Formats

RTSP (RTP, SDP)

5.8. رسانه ایمن

If device implementations support secure video output and are capable of supporting secure surfaces, they:

• [C-1-1] MUST declare support for Display.FLAG_SECURE .

If device implementations declare support for Display.FLAG_SECURE and support wireless display protocol, they:

• [C-2-1] MUST secure the link with a cryptographically strong mechanism such as HDCP 2.x or higher for the displays connected through wireless protocols such as Miracast.

If device implementations declare support for Display.FLAG_SECURE and support wired external display, they:

• [C-3-1] MUST support HDCP 1.2 or higher for all external displays connected via a user-accessible wired port.

5.9. رابط دیجیتال ابزار موسیقی (MIDI)

If device implementations report support for feature android.software.midi via the android.content.pm.PackageManager class, they:

• [C-1-1] MUST support MIDI over all MIDI-capable hardware transports for which they provide generic non-MIDI connectivity, where such transports are:

  • USB host mode, section 7.7
  • MIDI over Bluetooth LE acting in central role, section 7.4.3

• [C-1-2] MUST support the inter-app MIDI software transport (virtual MIDI devices)

• [C-1-3] MUST include libamidi.so (native MIDI support)

• SHOULD support MIDI over USB peripheral mode, section 7.7

5.10. صوتی حرفه ای

If device implementations report support for feature android.hardware.audio.pro via the android.content.pm.PackageManager class, they:

• [C-1-1] MUST report support for feature android.hardware.audio.low_latency .
• [C-1-2] MUST have the continuous round-trip audio latency, as defined in section 5.6 Audio Latency of 25 milliseconds or less over at least one supported path.
• [C-1-3] MUST include a USB port(s) supporting USB host mode and USB peripheral mode.
• [C-1-4] MUST report support for feature android.software.midi .
• [C-1-5] MUST meet latencies and USB audio requirements using the AAudio native audio API and AAUDIO_PERFORMANCE_MODE_LOW_LATENCY .
• [C-1-6] MUST have Cold output latency of 200 milliseconds or less.
• [C-1-7] MUST have Cold input latency of 200 milliseconds or less.
• [C-1-8] MUST have an average Tap-to-tone latency of 80 milliseconds or less over at least 5 measurements over the speaker to microphone data path.
• [C-SR-1] Are STRONGLY RECOMMENDED to meet latencies as defined in section 5.6 Audio Latency , of 20 milliseconds or less, over 5 measurements with a Mean Absolute Deviation less than 5 milliseconds over the speaker to microphone path.
• [C-SR-2] Are STRONGLY RECOMMENDED to meet the Pro Audio requirements for continuous round-trip audio latency, cold input latency and cold output latency and USB audio requirements using the AAudio native audio API over the MMAP path.

• [C-SR-3] Are STRONGLY RECOMMENDED to provide a consistent level of CPU performance while audio is active and CPU load is varying. This should be tested using the Android app SynthMark . SynthMark uses a software synthesizer running on a simulated audio framework that measures system performance. See the SynthMark documentation for an explanation of the benchmarks. The SynthMark app needs to be run using the “Automated Test” option and achieve the following results:

  • voicemark.90 >= 32 voices
  • latencymark.fixed.little <= 15 msec
  • latencymark.dynamic.little <= 50 msec

• SHOULD minimize audio clock inaccuracy and drift relative to standard time.

• SHOULD minimize audio clock drift relative to the CPU CLOCK_MONOTONIC when both are active.

• SHOULD minimize audio latency over on-device transducers.

• SHOULD minimize audio latency over USB digital audio.

• SHOULD document audio latency measurements over all paths.

• SHOULD minimize jitter in audio buffer completion callback entry times, as this affects usable percentage of full CPU bandwidth by the callback.

• SHOULD provide zero audio glitches under normal use at reported latency.

• SHOULD provide zero inter-channel latency difference.

• SHOULD minimize MIDI mean latency over all transports.

• SHOULD minimize MIDI latency variability under load (jitter) over all transports.

• SHOULD provide accurate MIDI timestamps over all transports.

• SHOULD minimize audio signal noise over on-device transducers, including the period immediately after cold start.

• SHOULD provide zero audio clock difference between the input and output sides of corresponding end-points, when both are active. Examples of corresponding end-points include the on-device microphone and speaker, or the audio jack input and output.

• SHOULD handle audio buffer completion callbacks for the input and output sides of corresponding end-points on the same thread when both are active, and enter the output callback immediately after the return from the input callback. Or if it is not feasible to handle the callbacks on the same thread, then enter the output callback shortly after entering the input callback to permit the application to have a consistent timing of the input and output sides.

• SHOULD minimize the phase difference between HAL audio buffering for the input and output sides of corresponding end-points.

• SHOULD minimize touch latency.

• SHOULD minimize touch latency variability under load (jitter).

If device implementations meet all of the above requirements, they:

• [C-SR-4] STRONGLY RECOMMENDED to report support for feature android.hardware.audio.pro via the android.content.pm.PackageManager class.

If device implementations include a 4 conductor 3.5mm audio jack, they:

• [C-2-1] MUST have a mean Continuous Round-trip Audio Latency, as defined in section 5.6 Audio Latency , of 20 milliseconds or less, over 5 measurements with a Mean Absolute Deviation less than 5 milliseconds over the audio jack path using an audio loopback dongle .
• [C-SR-5] STRONGLY RECOMMENDED to comply with section Mobile device (jack) specifications of the Wired Audio Headset Specification (v1.1) .

If device implementations omit a 4 conductor 3.5mm audio jack and include a USB port(s) supporting USB host mode, they:

• [C-3-1] MUST implement the USB audio class.
• [C-3-2] MUST have a mean Continuous Round-trip Audio Latency of 25 milliseconds or less, over 5 measurements with a Mean Absolute Deviation less than 5 milliseconds over the USB host mode port using USB audio class. (This can be measured using a USB-3.5mm adapter and an Audio Loopback Dongle, or using a USB audio interface with patch cables connecting the inputs to outputs).
• [C-SR-6] Are STRONGLY RECOMMENDED to support simultaneous I/O up to 8 channels each direction, 96 kHz sample rate, and 24-bit or 32-bit depth, when used with USB audio peripherals that also support these requirements.
• [C-SR-7] Are STRONGLY RECOMMENDED to meet this group of requirements using the AAudio native audio API over the MMAP path.

اگر پیاده سازی های دستگاه شامل یک پورت HDMI باشد، آنها:

• SHOULD support output in stereo and eight channels at 20-bit or 24-bit depth and 192 kHz without bit-depth loss or resampling, in at least one configuration.

5.11. ضبط برای پردازش نشده

Android includes support for recording of unprocessed audio via the android.media.MediaRecorder.AudioSource.UNPROCESSED audio source. In OpenSL ES, it can be accessed with the record preset SL_ANDROID_RECORDING_PRESET_UNPROCESSED .

If device implementations intent to support unprocessed audio source and make it available to third-party apps, they:

• [C-1-1] MUST report the support through the android.media.AudioManager property PROPERTY_SUPPORT_AUDIO_SOURCE_UNPROCESSED .

• [C-1-2] باید ویژگی های دامنه در مقابل فرکانس تقریباً مسطح را در محدوده فرکانس میانی نشان دهد: به طور خاص ± dB از 100 هرتز تا 7000 هرتز برای هر میکروفونی که برای ضبط منبع صوتی پردازش نشده استفاده می شود.

• [C-1-3] MUST exhibit amplitude levels in the low frequency range: specifically from ±20 dB from 5 z to 100 Hz compared to the mid-frequency range for each and every microphone used to record the unprocessed audio source.

• [C-1-4] MUST exhibit amplitude levels in the high frequency range: specifically from ±30 dB from 7000 Hz to 22 KHz compared to the mid-frequency range for each and every microphone used to record the unprocessed audio source.

• [C-1-5] MUST set audio input sensitivity such that a 1000 Hz sinusoidal tone source played at 94 dB Sound Pressure Level (SPL) yields a response with RMS of 520 for 16 bit-samples (or -36 dB Full Scale for floating point/double precision samples) for each and every microphone used to record the unprocessed audio source.

• [C-1-6] MUST have a signal-to-noise ratio (SNR) at 60 dB or higher for each and every microphone used to record the unprocessed audio source. (whereas the SNR is measured as the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted).

• [C-1-7] MUST have a total harmonic distortion (THD) less than be less than 1% for 1 kHZ at 90 dB SPL input level at each and every microphone used to record the unprocessed audio source.

• [C-1-8] MUST not have any other signal processing (eg Automatic Gain Control, High Pass Filter, or Echo cancellation) in the path other than a level multiplier to bring the level to desired range. به عبارت دیگر:

  • [C-1-9] If any signal processing is present in the architecture for any reason, it MUST be disabled and effectively introduce zero delay or extra latency to the signal path.
  • [C-1-10] The level multiplier, while allowed to be on the path, MUST NOT introduce delay or latency to the signal path.

All SPL measurements are made directly next to the microphone under test. For multiple microphone configurations, these requirements apply to each microphone.

If device implementations declare android.hardware.microphone but do not support unprocessed audio source, they:

• [C-2-1] MUST return null for the AudioManager.getProperty(PROPERTY_SUPPORT_AUDIO_SOURCE_UNPROCESSED) API method, to properly indicate the lack of support.
• [C-SR-1] are still STRONGLY RECOMMENDED to satisfy as many of the requirements for the signal path for the unprocessed recording source.

5.12. ویدیوی HDR

Android 13 supports the HDR technologies as described in an upcoming document.

Pixel Format

If a video decoder advertises support for COLOR_FormatYUVP010, then:

• [C-1-1] MUST support the P010 format for CPU-read (ImageReader, MediaImage, ByteBuffer). In Android 13, P010 is relaxed to allow arbitrary stride for the Y and UV planes.

• [C-1-2] The P010 output buffer MUST be able to be sampled by the GPU (when allocated with GPU_SAMPLING usage). This enables GPU composition and custom tone mapping by apps.

If a video decoder advertises support for COLOR_Format32bitABGR2101010, it:

• [C-2-1] MUST support the RGBA_1010102 format for output surface and CPU-readable (ByteBuffer output).

If a video encoder advertises support for COLOR_FormatYUVP010, it:

• [C-3-1] MUST support the P010 format for input surface and CPU-writeable (ImageWriter, MediaImage, ByteBuffer) input.

If a video encoder advertises support for COLOR_Format32bitABGR2101010, it:

• [C-4-1] MUST support RGBA_1010102 format for input surface and CPU-writeable (ImageWriter, ByteBuffer) input. Note: Converting between various transfer curves is NOT required for encoders.

HDR Capture Requirements

For all video encoders that support HDR profiles, device implementations:

• [C-5-1] MUST NOT assume that the HDR metadata is precise. For example, the encoded frame could have pixels beyond the peak luminance level, or the histogram might not be representative of the frame.

• SHOULD aggregate HDR dynamic metadata to generate appropriate HDR static metadata for encoded streams, and they should output it at the end of each encoding session.

If device implementations support HDR capture using the CamcorderProfile APIs then they:

• [C-6-1] MUST support HDR capture through the Camera2 APIs as well.

• [C-6-2] MUST support at least one hardware-accelerated video encoder for each HDR technology supported.

• [C-6-3] MUST support (at the minimum) HLG capture.

• [C-6-4] MUST support writing the HDR metadata (if applicable to the HDR technology) into the captured video file. For AV1, HEVC, and DolbyVision this means including the metadata into the encoded bitstream.

• [C-6-5] MUST support P010 and COLOR_FormatYUVP010.

• [C-6-6] MUST support HDR to SDR tone mapping in the default hardware-accelerated decoder for the captured profile. In other words, if a device can capture HDR10+ HEVC, the default HEVC decoder MUST be able to decode the captured stream in SDR.

HDR Editing Requirements

If device implementations include video encoders that support HDR editing, then they:

• SHOULD use minimal latency for generating the HDR metadata when not present, and SHOULD gracefully handle situations where the metadata is present for some frames and not for others. This metadata SHOULD be precise (for example, represent the actual peak luminance and histogram of the frame).

If device implementation includes codecs that support FEATURE_HdrEditing, then those codecs:

• [C-7-1] MUST support at least one HDR profile.

• [C-7-2] MUST support FEATURE_HdrEditing for all HDR profiles advertised by that codec. In other words, they MUST support generating HDR metadata when not present for all HDR profiles supported that use HDR metadata.

• [C-7-3] MUST support the following video encoder input formats that fully preserve the HDR decoded signal:

  • RGBA_1010102 (already in the target transfer curve) for both input surface and ByteBuffer and MUST advertise support for COLOR_Format32bitABGR2101010.

If device implementation includes codecs that support FEATURE_HdrEditing, then the device:

• [C-7-4] MUST advertise support for EXT_YUV_target OpenGL extension.

6. سازگاری با ابزارها و گزینه های توسعه دهنده

6.1. ابزارهای توسعه دهنده

پیاده سازی دستگاه:

• [C-0-1] MUST support the Android Developer Tools provided in the Android SDK.

• پل اشکال زدایی اندروید (adb)

  • [C-0-2] MUST support adb as documented in the Android SDK and the shell commands provided in the AOSP, which can be used by app developers, including dumpsys cmd stats
  • [C-0-11] MUST support the shell command cmd testharness . Upgrading device implementations from an earlier Android version without a persistent data block MAY be exempted from C-0-11.
  • [C-0-3] MUST NOT alter the format or the contents of device system events (batterystats , diskstats, fingerprint, graphicsstats, netstats, notification, procstats) logged via the dumpsys command.
  • [C-0-10] MUST record, without omission, and make the following events accessible and available to the cmd stats shell command and the StatsManager System API class.
    • ActivityForegroundStateChanged
    • AnomalyDetected
    • AppBreadcrumbReported
    • AppCrashOccurred
    • AppStartOccurred
    • BatteryLevelChanged
    • BatterySaverModeStateChanged
    • BleScanResultReceived
    • BleScanStateChanged
    • ChargingStateChanged
    • DeviceIdleModeStateChanged
    • ForegroundServiceStateChanged
    • GpsScanStateChanged
    • JobStateChanged
    • PluggedStateChanged
    • ScheduledJobStateChanged
    • ScreenStateChanged
    • SyncStateChanged
    • SystemElapsedRealtime
    • UidProcessStateChanged
    • WakelockStateChanged
    • WakeupAlarmOccurred
    • WifiLockStateChanged
    • WifiMulticastLockStateChanged
    • WifiScanStateChanged
  • [C-0-4] MUST have the device-side adb daemon be inactive by default and there MUST be a user-accessible mechanism to turn on the Android Debug Bridge.
  • [C-0-5] MUST support secure adb. Android includes support for secure adb. Secure adb enables adb on known authenticated hosts.
  • [C-0-6] MUST provide a mechanism allowing adb to be connected from a host machine. به طور مشخص:

  If device implementations without a USB port support peripheral mode, they:

  • [C-3-1] MUST implement adb via local-area network (such as Ethernet or Wi-Fi).
  • [C-3-2] MUST provide drivers for Windows 7, 8 and 10, allowing developers to connect to the device using the adb protocol.

  If device implementations support adb connections to a host machine via Wi-Fi or Ethernet, they:

  • [C-4-1] MUST have the AdbManager#isAdbWifiSupported() method return true .

  If device implementations support adb connections to a host machine via Wi-Fi or Ethernet, and includes at least one camera, they:

  • [C-5-1] MUST have the AdbManager#isAdbWifiQrSupported() method return true .

• Dalvik Debug Monitor Service (ddms)

  • [C-0-7] MUST support all ddms features as documented in the Android SDK. As ddms uses adb, support for ddms SHOULD be inactive by default, but MUST be supported whenever the user has activated the Android Debug Bridge, as above.

• SysTrace

  • [C-0-9] MUST support the systrace tool as documented in the Android SDK. Systrace must be inactive by default and there MUST be a user-accessible mechanism to turn on Systrace.

• پرفتو

  • [C-SR-1] Are STRONGLY RECOMMENDED to expose a /system/bin/perfetto binary to the shell user which cmdline complies with the perfetto documentation .
  • [C-SR-2] The perfetto binary is STRONGLY RECOMMENDED to accept as input a protobuf config that complies with the schema defined in the perfetto documentation .
  • [C-SR-3] The perfetto binary is STRONGLY RECOMMENDED to write as output a protobuf trace that complies with the schema defined in the perfetto documentation .
  • [C-SR-4] Are STRONGLY RECOMMENDED to provide, through the perfetto binary, at least the data sources described in the perfetto documentation .

• Low Memory Killer

  • [C-0-12] MUST write a LMK_KILL_OCCURRED_FIELD_NUMBER Atom to the statsd log when an app is terminated by the Low Memory Killer .

• Test Harness Mode If device implementations support the shell command cmd testharness and run cmd testharness enable , they:

  • [C-2-1] MUST return true for ActivityManager.isRunningInUserTestHarness()
  • [C-2-2] MUST implement Test Harness Mode as described in Test Harness Mode documentation .

• GPU work information

  پیاده سازی دستگاه:

  • [C-0-13] MUST implement the shell command dumpsys gpu --gpuwork to display the aggregated GPU work data returned by the power/gpu_work_period kernel tracepoint, or display no data if the tracepoint is not supported. The AOSP implementation is frameworks/native/services/gpuservice/gpuwork/ .

If device implementations report the support of Vulkan 1.0 or higher via the android.hardware.vulkan.version feature flags, they:

• [C-1-1] MUST provide an affordance for the app developer to enable/disable GPU debug layers.
• [C-1-2] MUST, when the GPU debug layers are enabled, enumerate layers in libraries provided by external tools (ie not part of the platform or application package) found in debuggable applications' base directory to support vkEnumerateInstanceLayerProperties() and vkCreateInstance() API methods.

6.2. گزینه های توسعه دهنده

Android includes support for developers to configure application development-related settings.

Device implementations MUST provide a consistent experience for Developer Options, they:

• [C-0-1] MUST honor the android.settings.APPLICATION_DEVELOPMENT_SETTINGS intent to show application development-related settings. The upstream Android implementation hides the Developer Options menu by default and enables users to launch Developer Options after pressing seven (7) times on the Settings > About Device > Build Number menu item.
• [C-0-2] MUST hide Developer Options by default.
• [C-0-3] MUST provide a clear mechanism that does not give preferential treatment to one third-party app as opposed to another to enable Developer Options. MUST provide a public visible document or website that describes how to enable Developer Options. This document or website MUST be linkable from the Android SDK documents.
• SHOULD have an ongoing visual notification to the user when Developer Options is enabled and the safety of the user is of concern.
• MAY temporarily limit access to the Developer Options menu, by visually hiding or disabling the menu, to prevent distraction for scenarios where the safety of the user is of concern.

7. سازگاری سخت افزار

If a device includes a particular hardware component that has a corresponding API for third-party developers:

• [C-0-1] The device implementation MUST implement that API as described in the Android SDK documentation.

If an API in the SDK interacts with a hardware component that is stated to be optional and the device implementation does not possess that component:

• [C-0-2] Complete class definitions (as documented by the SDK) for the component APIs MUST still be presented.
• [C-0-3] The API's behaviors MUST be implemented as no-ops in some reasonable fashion.
• [C-0-4] API methods MUST return null values where permitted by the SDK documentation.
• [C-0-5] API methods MUST return no-op implementations of classes where null values are not permitted by the SDK documentation.
• [C-0-6] API methods MUST NOT throw exceptions not documented by the SDK documentation.
• [C-0-7] Device implementations MUST consistently report accurate hardware configuration information via the getSystemAvailableFeatures() and hasSystemFeature(String) methods on the android.content.pm.PackageManager class for the same build fingerprint.

A typical example of a scenario where these requirements apply is the telephony API: Even on non-phone devices, these APIs must be implemented as reasonable no-ops.

7.1. Display and Graphics

Android includes facilities that automatically adjust application assets and UI layouts appropriately for the device to ensure that third-party applications run well on a variety of hardware configurations . On the Android-compatible display(s) where all third-party Android-compatible applications can run, device implementations MUST properly implement these APIs and behaviors, as detailed in this section.

The units referenced by the requirements in this section are defined as follows:

• physical diagonal size . The distance in inches between two opposing corners of the illuminated portion of the display.
• dots per inch (dpi) . The number of pixels encompassed by a linear horizontal or vertical span of 1”. Where dpi values are listed, both horizontal and vertical dpi must fall within the range.
• aspect ratio . The ratio of the pixels of the longer dimension to the shorter dimension of the screen. For example, a display of 480x854 pixels would be 854/480 = 1.779, or roughly “16:9”.
• density-independent pixel (dp) . The virtual pixel unit normalized to a 160 dpi screen, calculated as: pixels = dps * (density/160).

7.1.1. پیکربندی صفحه نمایش

7.1.1.1. Screen Size and Shape

The Android UI framework supports a variety of different logical screen layout sizes, and allows applications to query the current configuration's screen layout size via Configuration.screenLayout with the SCREENLAYOUT_SIZE_MASK and Configuration.smallestScreenWidthDp .

پیاده سازی دستگاه:

• [C-0-1] MUST report the correct layout size for the Configuration.screenLayout as defined in the Android SDK documentation. Specifically, device implementations MUST report the correct logical density-independent pixel (dp) screen dimensions as below:

  • Devices with the Configuration.uiMode set as any value other than UI_MODE_TYPE_WATCH, and reporting a small size for the Configuration.screenLayout , MUST have at least 426 dp x 320 dp.
  • Devices reporting a normal size for the Configuration.screenLayout , MUST have at least 480 dp x 320 dp.
  • Devices reporting a large size for the Configuration.screenLayout , MUST have at least 640 dp x 480 dp.
  • Devices reporting a xlarge size for the Configuration.screenLayout , MUST have at least 960 dp x 720 dp.

• [C-0-2] MUST correctly honor applications' stated support for screen sizes through the < supports-screens > attribute in the AndroidManifest.xml, as described in the Android SDK documentation.

• MAY have the Android-compatible display(s) with rounded corners.

If device implementations support UI_MODE_TYPE_NORMAL and include Android-compatible display(s) with rounded corners, they:

• [C-1-1] MUST ensure that at least one of the following requirements is met:

  • The radius of the rounded corners is less than or equal to 38 dp.
  • When a 15 dp by 15 dp box is anchored at each corner of the logical display, at least one pixel of each box is visible on the screen.

• SHOULD include user affordance to switch to the display mode with the rectangular corners.

If device implementations include an Android-compatible display(s) that is foldable, or includes a folding hinge between multiple display panels and makes such display(s) available to render third-party apps, they:

• [C-2-1] MUST implement the latest available stable version of the extensions API or the stable version of sidecar API to be used by Window Manager Jetpack library.

If device implementations include an Android-compatible display(s) that is foldable, or includes a folding hinge between multiple display panels and if the hinge or fold crosses a fullscreen application window, they:

• [C-3-1] MUST report the position, bounds and state of hinge or fold through extensions or sidecar APIs to the application.

For details on correctly implementing the sidecar or extension APIs refer to the public documentation of Window Manager Jetpack .

7.1.1.2. نسبت ابعاد صفحه نمایش

While there is no restriction to the aspect ratio of the physical display for the Android-compatible display(s), the aspect ratio of the logical display where third-party apps are rendered, which can be derived from the height and width values reported through the view.Display APIs and Configuration APIs, MUST meet the following requirements:

• [C-0-1] Device implementations with Configuration.uiMode set to UI_MODE_TYPE_NORMAL MUST have an aspect ratio value less than or equal to 1.86 (roughly 16:9), unless the app meets one of the following conditions:

  • The app has declared that it supports a larger screen aspect ratio through the android.max_aspect metadata value.
  • The app declares it is resizeable via the android:resizeableActivity attribute.
  • The app targets API level 24 or higher and does not declare an android:maxAspectRatio that would restrict the allowed aspect ratio.

• [C-0-3] Device implementations with the Configuration.uiMode set as UI_MODE_TYPE_WATCH MUST have an aspect ratio value set as 1.0 (1:1).

7.1.1.3. Screen Density

The Android UI framework defines a set of standard logical densities to help application developers target application resources.

• [C-0-1] By default, device implementations MUST report only one of the Android framework densities that are listed on DisplayMetrics through the DENSITY_DEVICE_STABLE API and this value MUST NOT change at any time; however, the device MAY report a different arbitrary density according to the display configuration changes made by the user (for example, display size) set after initial boot.

• پیاده‌سازی دستگاه باید چگالی چارچوب استاندارد Android را که از نظر عددی به چگالی فیزیکی صفحه نزدیک‌ترین باشد، تعریف کند، مگر اینکه این چگالی منطقی اندازه صفحه نمایش گزارش‌شده را به کمتر از حداقل پشتیبانی‌شده فشار دهد. If the standard Android framework density that is numerically closest to the physical density results in a screen size that is smaller than the smallest supported compatible screen size (320 dp width), device implementations SHOULD report the next lowest standard Android framework density.

If there is an affordance to change the display size of the device:

• [C-1-1] The display size MUST NOT be scaled any larger than 1.5 times the native density or produce an effective minimum screen dimension smaller than 320dp (equivalent to resource qualifier sw320dp), whichever comes first.
• [C-1-2] Display size MUST NOT be scaled any smaller than 0.85 times the native density.
• To ensure good usability and consistent font sizes, it is RECOMMENDED that the following scaling of Native Display options be provided (while complying with the limits specified above)
  • Small: 0.85x
  • Default: 1x (Native display scale)
  • Large: 1.15x
  • Larger: 1.3x
  • Largest 1.45x

7.1.2. Display Metrics

If device implementations include the Android-compatible display(s) or video output to the Android-compatible display screen(s), they:

• [C-1-1] MUST report correct values for all Android-compatible display metrics defined in the android.util.DisplayMetrics API.

If device implementations does not include an embedded screen or video output, they:

• [C-2-1] MUST report correct values of the Android-compatible display as defined in the android.util.DisplayMetrics API for the emulated default view.Display .

7.1.3. Screen Orientation

پیاده سازی دستگاه:

• [C-0-1] MUST report which screen orientations they support ( android.hardware.screen.portrait and/or android.hardware.screen.landscape ) and MUST report at least one supported orientation. For example, a device with a fixed orientation landscape screen, such as a television or laptop, SHOULD only report android.hardware.screen.landscape .
• [C-0-2] MUST report the correct value for the device's current orientation, whenever queried via the android.content.res.Configuration.orientation , android.view.Display.getOrientation() , or other APIs.

If device implementations support both screen orientations, they:

• [C-1-1] MUST support dynamic orientation by applications to either portrait or landscape screen orientation. That is, the device must respect the application's request for a specific screen orientation.
• [C-1-2] MUST NOT change the reported screen size or density when changing orientation.
• MAY select either portrait or landscape orientation as the default.

7.1.4. 2D and 3D Graphics Acceleration

7.1.4.1 OpenGL ES

پیاده سازی دستگاه:

• [C-0-1] MUST correctly identify the supported OpenGL ES versions (1.1, 2.0, 3.0, 3.1, 3.2) through the managed APIs (such as via the GLES10.getString() method) and the native APIs.
• [C-0-2] MUST include the support for all the corresponding managed APIs and native APIs for every OpenGL ES versions they identified to support.

اگر پیاده سازی های دستگاه شامل یک صفحه نمایش یا خروجی ویدیو باشد، آنها:

• [C-1-1] MUST support both OpenGL ES 1.1 and 2.0, as embodied and detailed in the Android SDK documentation .
• [C-SR-1] Are STRONGLY RECOMMENDED to support OpenGL ES 3.1.
• SHOULD support OpenGL ES 3.2.

The OpenGL ES dEQP tests are partitioned into a number of test lists, each with an associated date/version number. These are in the Android source tree at external/deqp/android/cts/main/glesXX-main-YYYY-MM-DD.txt . A device that supports OpenGL ES at a self-reported level indicates that it can pass the dEQP tests in all test lists from this level and earlier.

If device implementations support any of the OpenGL ES versions, they:

• [C-2-1] MUST report via the OpenGL ES managed APIs and native APIs any other OpenGL ES extensions they have implemented, and conversely MUST NOT report extension strings that they do not support.
• [C-2-2] MUST support the EGL_KHR_image , EGL_KHR_image_base , EGL_ANDROID_image_native_buffer , EGL_ANDROID_get_native_client_buffer , EGL_KHR_wait_sync , EGL_KHR_get_all_proc_addresses , EGL_ANDROID_presentation_time , EGL_KHR_swap_buffers_with_damage , EGL_ANDROID_recordable , and EGL_ANDROID_GLES_layers extensions.
• [C-2-3] MUST report the maximum version of the OpenGL ES dEQP tests supported via the android.software.opengles.deqp.level feature flag.
• [C-2-4] MUST at least support version 132383489 (from Mar 1st, 2020) as reported in the android.software.opengles.deqp.level feature flag.
• [C-2-5] MUST pass all OpenGL ES dEQP Tests in the test lists between version 132383489 and the version specified in the android.software.opengles.deqp.level feature flag, for each supported OpenGL ES version.
• [C-SR-2] Are STRONGLY RECOMMENDED to support the EGL_KHR_partial_update and OES_EGL_image_external extensions.
• SHOULD accurately report via the getString() method, any texture compression format that they support, which is typically vendor-specific.
• SHOULD support the EGL_IMG_context_priority and EGL_EXT_protected_content extensions.

If device implementations declare support for OpenGL ES 3.0, 3.1, or 3.2, they:

• [C-3-1] MUST export the corresponding function symbols for these version in addition to the OpenGL ES 2.0 function symbols in the libGLESv2.so library.
• [C-SR-3] Are STRONGLY RECOMMENDED to support the OES_EGL_image_external_essl3 extension.

If device implementations support OpenGL ES 3.2, they:

• [C-4-1] MUST support the OpenGL ES Android Extension Pack in its entirety.

If device implementations support the OpenGL ES Android Extension Pack in its entirety, they:

• [C-5-1] MUST identify the support through the android.hardware.opengles.aep feature flag.

If device implementations expose support for the EGL_KHR_mutable_render_buffer extension, they:

• [C-6-1] MUST also support the EGL_ANDROID_front_buffer_auto_refresh extension.

7.1.4.2 Vulkan

Android includes support for Vulkan , a low-overhead, cross-platform API for high-performance 3D graphics.

If device implementations support OpenGL ES 3.1, they:

• [C-SR-1] Are STRONGLY RECOMMENDED to include support for Vulkan 1.3.
• [C-4-1] MUST NOT support a Vulkan variant version (ie the variant part of the Vulkan core version MUST be zero).

اگر پیاده سازی های دستگاه شامل یک صفحه نمایش یا خروجی ویدیو باشد، آنها:

• [C-SR-2] Are STRONGLY RECOMMENDED to include support for Vulkan 1.3.

The Vulkan dEQP tests are partitioned into a number of test lists, each with an associated date/version. These are in the Android source tree at external/deqp/android/cts/main/vk-main-YYYY-MM-DD.txt . A device that supports Vulkan at a self-reported level indicates that it can pass the dEQP tests in all test lists from this level and earlier.

If device implementations include support for Vulkan 1.0 or higher, they:

• [C-1-1] MUST report the correct integer value with the android.hardware.vulkan.level and android.hardware.vulkan.version feature flags.
• [C-1-2] MUST enumerate, at least one VkPhysicalDevice for the Vulkan native API vkEnumeratePhysicalDevices() .
• [C-1-3] MUST fully implement the Vulkan 1.0 APIs for each enumerated VkPhysicalDevice .
• [C-1-4] MUST enumerate layers, contained in native libraries named as libVkLayer*.so in the application package's native library directory, through the Vulkan native APIs vkEnumerateInstanceLayerProperties() and vkEnumerateDeviceLayerProperties() .
• [C-1-5] MUST NOT enumerate layers provided by libraries outside of the application package, or provide other ways of tracing or intercepting the Vulkan API, unless the application has the android:debuggable attribute set as true .
• [C-1-6] MUST report all extension strings that they do support via the Vulkan native APIs , and conversely MUST NOT report extension strings that they do not correctly support.
• [C-1-7] MUST support the VK_KHR_surface, VK_KHR_android_surface, VK_KHR_swapchain, and VK_KHR_incremental_present extensions.
• [C-1-8] MUST report the maximum version of the Vulkan dEQP Tests supported via the android.software.vulkan.deqp.level feature flag.
• [C-1-9] MUST at least support version 132317953 (from Mar 1st, 2019) as reported in the android.software.vulkan.deqp.level feature flag.
• [C-1-10] MUST pass all Vulkan dEQP Tests in the test lists between version 132317953 and the version specified in the android.software.vulkan.deqp.level feature flag.
• [C-1-11] MUST NOT enumerate support for the VK_KHR_video_queue, VK_KHR_video_decode_queue, or VK_KHR_video_encode_queue extensions.
• [C-SR-3] Are STRONGLY RECOMMENDED to support the VK_KHR_driver_properties and VK_GOOGLE_display_timing extensions.
• SHOULD support VkPhysicalDeviceProtectedMemoryFeatures and VK_EXT_global_priority .
• [C-1-12] MUST NOT enumerate support for the VK_KHR_performance_query extension.
• [C-SR-4] Are STRONGLY RECOMMENDED to satisfy the requirements specified by the Android Baseline 2021 profile.

If device implementations do not include support for Vulkan 1.0, they:

• [C-2-1] MUST NOT declare any of the Vulkan feature flags (eg android.hardware.vulkan.level , android.hardware.vulkan.version ).
• [C-2-2] MUST NOT enumerate any VkPhysicalDevice for the Vulkan native API vkEnumeratePhysicalDevices() .

If device implementations include support for Vulkan 1.1 and declare any of the Vulkan feature flags, they:

• [C-3-1] MUST expose support for the SYNC_FD external semaphore and handle types and the VK_ANDROID_external_memory_android_hardware_buffer extension.

7.1.4.3 RenderScript

• [C-0-1] Device implementations MUST support Android RenderScript , as detailed in the Android SDK documentation.

7.1.4.4 2D Graphics Acceleration

Android includes a mechanism for applications to declare that they want to enable hardware acceleration for 2D graphics at the Application, Activity, Window, or View level through the use of a manifest tag android:hardwareAccelerated or direct API calls.

پیاده سازی دستگاه:

• [C-0-1] MUST enable hardware acceleration by default, and MUST disable hardware acceleration if the developer so requests by setting android:hardwareAccelerated="false” or disabling hardware acceleration directly through the Android View APIs.
• [C-0-2] MUST exhibit behavior consistent with the Android SDK documentation on hardware acceleration .

Android includes a TextureView object that lets developers directly integrate hardware-accelerated OpenGL ES textures as rendering targets in a UI hierarchy.

پیاده سازی دستگاه:

• [C-0-3] MUST support the TextureView API, and MUST exhibit consistent behavior with the upstream Android implementation.

7.1.4.5 Wide-gamut Displays

If device implementations claim support for wide-gamut displays through Configuration.isScreenWideColorGamut() , they:

• [C-1-1] MUST have a color-calibrated display.
• [C-1-2] MUST have a display whose gamut covers the sRGB color gamut entirely in CIE 1931 xyY space.
• [C-1-3] MUST have a display whose gamut has an area of at least 90% of DCI-P3 in CIE 1931 xyY space.
• [C-1-4] MUST support OpenGL ES 3.1 or 3.2 and report it properly.
• [C-1-5] MUST advertise support for the EGL_KHR_no_config_context , EGL_EXT_pixel_format_float , EGL_KHR_gl_colorspace , EGL_EXT_gl_colorspace_scrgb , EGL_EXT_gl_colorspace_scrgb_linear , EGL_EXT_gl_colorspace_display_p3 , EGL_EXT_gl_colorspace_display_p3_linear , and EGL_EXT_gl_colorspace_display_p3_passthrough extensions.
• [C-SR-1] Are STRONGLY RECOMMENDED to support GL_EXT_sRGB .

Conversely, if device implementations do not support wide-gamut displays, they:

• [C-2-1] SHOULD cover 100% or more of sRGB in CIE 1931 xyY space, although the screen color gamut is undefined.

7.1.5. Legacy Application Compatibility Mode

Android specifies a “compatibility mode” in which the framework operates in a 'normal' screen size equivalent (320dp width) mode for the benefit of legacy applications not developed for old versions of Android that pre-date screen-size independence.

7.1.6. Screen Technology

The Android platform includes APIs that allow applications to render rich graphics to an Android-compatible display. Devices MUST support all of these APIs as defined by the Android SDK unless specifically allowed in this document.

All of a device implementation's Android-compatible displays:

• [C-0-1] MUST be capable of rendering 16-bit color graphics.
• SHOULD support displays capable of 24-bit color graphics.
• [C-0-2] MUST be capable of rendering animations.
• [C-0-3] MUST have a pixel aspect ratio (PAR) between 0.9 and 1.15. That is, the pixel aspect ratio MUST be near square (1.0) with a 10 ~ 15% tolerance.

7.1.7. Secondary Displays

Android includes support for secondary Android-compatible displays to enable media sharing capabilities and developer APIs for accessing external displays.

If device implementations support an external display either via a wired, wireless, or an embedded additional display connection, they:

• [C-1-1] MUST implement the DisplayManager system service and API as described in the Android SDK documentation.

7.2. دستگاه های ورودی

پیاده سازی دستگاه:

• [C-0-1] MUST include an input mechanism, such as a touchscreen or non-touch navigation , to navigate between the UI elements.

7.2.1. صفحه کلید

If device implementations include support for third-party Input Method Editor (IME) applications, they:

• [C-1-1] MUST declare the android.software.input_methods feature flag.
• [C-1-2] MUST implement fully Input Management Framework
• [C-1-3] MUST have a preinstalled software keyboard.

پیاده سازی دستگاه:

• [C-0-1] MUST NOT include a hardware keyboard that does not match one of the formats specified in android.content.res.Configuration.keyboard (QWERTY or 12-key).
• SHOULD include additional soft keyboard implementations.
• MAY include a hardware keyboard.

7.2.2. Non-touch Navigation

Android includes support for d-pad, trackball, and wheel as mechanisms for non-touch navigation.

پیاده سازی دستگاه:

• [C-0-1] MUST report the correct value for android.content.res.Configuration.navigation .

If device implementations lack non-touch navigations, they:

• [C-1-1] MUST provide a reasonable alternative user interface mechanism for the selection and editing of text, compatible with Input Management Engines. The upstream Android open source implementation includes a selection mechanism suitable for use with devices that lack non-touch navigation inputs.

7.2.3. کلیدهای ناوبری

The Home , Recents , and Back functions typically provided via an interaction with a dedicated physical button or a distinct portion of the touch screen, are essential to the Android navigation paradigm and therefore, device implementations:

• [C-0-1] MUST provide a user affordance to launch installed applications that have an activity with the <intent-filter> set with ACTION=MAIN and CATEGORY=LAUNCHER or CATEGORY=LEANBACK_LAUNCHER for Television device implementations. The Home function SHOULD be the mechanism for this user affordance.
• باید دکمه هایی را برای عملکرد Recents و Back ارائه کند.

If the Home, Recents, or Back functions are provided, they:

• [C-1-1] MUST be accessible with a single action (eg tap, double-click or gesture) when any of them are accessible.
• [C-1-2] MUST provide a clear indication of which single action would trigger each function. Having a visible icon imprinted on the button, showing a software icon on the navigation bar portion of the screen, or walking the user through a guided step-by-step demo flow during the out-of-box setup experience are examples of such an نشانه

پیاده سازی دستگاه:

• [C-SR-1] are STRONGLY RECOMMENDED to not provide the input mechanism for the Menu function as it is deprecated in favor of action bar since Android 4.0.

• [C-SR-2] Are STRONGLY RECOMMENDED to provide all navigation functions as cancellable. 'Cancellable' is defined as the user's ability to prevent the navigation function from executing (eg going home, going back, etc.) if the swipe is not released past a certain threshold.

اگر پیاده سازی های دستگاه تابع Menu را ارائه دهند، آنها:

• [C-2-1] MUST display the action overflow button whenever the action overflow menu popup is not empty and the action bar is visible.
• [C-2-2] MUST NOT modify the position of the action overflow popup displayed by selecting the overflow button in the action bar, but MAY render the action overflow popup at a modified position on the screen when it is displayed by selecting the Menu تابع

If device implementations do not provide the Menu function, for backwards compatibility, they: * [C-3-1] MUST make the Menu function available to applications when targetSdkVersion is less than 10, either by a physical button, a software key, or ژست ها This Menu function should be accessible unless hidden together with other navigation functions.

اگر پیاده‌سازی‌های دستگاه تابع Assist را ارائه دهند، آنها:

• [C-4-1] MUST make the Assist function accessible with a single action (eg tap, double-click or gesture) when other navigation keys are accessible.
• [C-SR-3] اکیداً توصیه می شود از فشار طولانی روی عملکرد HOME به عنوان این تعامل تعیین شده استفاده کنید.

If device implementations use a distinct portion of the screen to display the navigation keys, they:

• [C-5-1] Navigation keys MUST use a distinct portion of the screen, not available to applications, and MUST NOT obscure or otherwise interfere with the portion of the screen available to applications.
• [C-5-2] MUST make available a portion of the display to applications that meets the requirements defined in section 7.1.1 .
• [C-5-3] MUST honor the flags set by the app through the View.setSystemUiVisibility() API method, so that this distinct portion of the screen (aka the navigation bar) is properly hidden away as documented in the SDK.

If the navigation function is provided as an on-screen, gesture-based action:

• [C-6-1] WindowInsets#getMandatorySystemGestureInsets() MUST only be used to report the Home gesture recognition area.
• [C-6-2] Gestures that start within an exclusion rect as provided by the foreground application via View#setSystemGestureExclusionRects() , but outside of WindowInsets#getMandatorySystemGestureInsets() , MUST NOT be intercepted for the navigation function as long as the exclusion rect is allowed within the max exclusion limit as specified in the documentation for View#setSystemGestureExclusionRects() .
• [C-6-3] MUST send the foreground app a MotionEvent.ACTION_CANCEL event once touches start being intercepted for a system gesture, if the foreground app was previously sent an MotionEvent.ACTION_DOWN event.
• [C-6-4] MUST provide a user affordance to switch to an on-screen, button-based navigation (for example, in Settings).
• SHOULD provide Home function as a swipe up from the bottom edge of the current orientation of the screen.
• SHOULD provide Recents function as a swipe up and hold before release, from the same area as the Home gesture.
• Gestures that start within WindowInsets#getMandatorySystemGestureInsets() SHOULD NOT be affected by exclusion rects provided by the foreground application via View#setSystemGestureExclusionRects() .

If a navigation function is provided from anywhere on the left and right edges of the current orientation of the screen:

• [C-7-1] The navigation function MUST be Back and provided as a swipe from both left and right edges of the current orientation of the screen.
• [C-7-2] If custom swipeable system panels are provided on the left or right edges, they MUST be placed within the top 1/3rd of the screen with a clear, persistent visual indication that dragging in would invoke the aforementioned panels, and hence not Back. A system panel MAY be configured by a user such that it lands below the top 1/3rd of the screen edge(s) but the system panel MUST NOT use longer than 1/3rd of the edge(s).
• [C-7-3] When the foreground app has either the View.SYSTEM_UI_FLAG_IMMERSIVE, View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY, WindowInsetsController.BEHAVIOR_DEFAULT, or WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE flags set, swiping from the edges MUST behave as implemented in AOSP, which is documented in the SDK .
• [C-7-4] When the foreground app has either the View.SYSTEM_UI_FLAG_IMMERSIVE, View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY, WindowInsetsController.BEHAVIOR_DEFAULT, or WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE flags set, custom swipeable system panels MUST be hidden until the user brings in or un-dims the system bars (aka navigation and status bar) as implemented in AOSP.

If the back navigation function is provided and the user cancels the Back gesture, then:

• [C-8-1] OnBackInvokedCallback.onBackCancelled() MUST be called.
• [C-8-2] OnBackInvokedCallback.onBackInvoked() MUST NOT be called.
• [C-8-3] KEYCODE_BACK event MUST NOT be dispatched.

If the back navigation function is provided but the foreground application does NOT have an OnBackInvokedCallback registered, then:

• The system SHOULD provide an animation for the foreground application that suggests that the user is going back, as provided in AOSP.

If device implementations provide support for the system API setNavBarMode to allow any system app with android.permission.STATUS_BAR permission to set the navigation bar mode, then they:

• [C-9-1] MUST provide support for kid-friendly icons or button-based navigation as provided in the AOSP code.

7.2.4. Touchscreen Input

Android includes support for a variety of pointer input systems, such as touchscreens, touch pads, and fake touch input devices. Touchscreen-based device implementations are associated with a display such that the user has the impression of directly manipulating items on screen. Since the user is directly touching the screen, the system does not require any additional affordances to indicate the objects being manipulated.

پیاده سازی دستگاه:

• SHOULD have a pointer input system of some kind (either mouse-like or touch).
• SHOULD support fully independently tracked pointers.

If device implementations include a touchscreen (single-touch or better) on a primary Android-compatible display, they:

• [C-1-1] MUST report TOUCHSCREEN_FINGER for the Configuration.touchscreen API field.
• [C-1-2] MUST report the android.hardware.touchscreen and android.hardware.faketouch feature flags.

If device implementations include a touchscreen that can track more than a single touch on a primary Android-compatible display, they:

• [C-2-1] MUST report the appropriate feature flags android.hardware.touchscreen.multitouch , android.hardware.touchscreen.multitouch.distinct , android.hardware.touchscreen.multitouch.jazzhand corresponding to the type of the specific touchscreen on the دستگاه

If device implementations rely on an external input device such as mouse or trackball (ie not directly touching the screen) for input on a primary Android-compatible display and meet the fake touch requirements in section 7.2.5 , they:

• [C-3-1] MUST NOT report any feature flag starting with android.hardware.touchscreen .
• [C-3-2] MUST report only android.hardware.faketouch .
• [C-3-3] MUST report TOUCHSCREEN_NOTOUCH for the Configuration.touchscreen API field.

7.2.5. Fake Touch Input

Fake touch interface provides a user input system that approximates a subset of touchscreen capabilities. For example, a mouse or remote control that drives an on-screen cursor approximates touch, but requires the user to first point or focus then click. Numerous input devices like the mouse, trackpad, gyro-based air mouse, gyro-pointer, joystick, and multi-touch trackpad can support fake touch interactions. Android includes the feature constant android.hardware.faketouch, which corresponds to a high-fidelity non-touch (pointer-based) input device such as a mouse or trackpad that can adequately emulate touch-based input (including basic gesture support), and indicates that the device supports an emulated subset of touchscreen functionality.

If device implementations do not include a touchscreen but include another pointer input system which they want to make available, they:

• SHOULD declare support for the android.hardware.faketouch feature flag.

If device implementations declare support for android.hardware.faketouch , they:

• [C-1-1] MUST report the absolute X and Y screen positions of the pointer location and display a visual pointer on the screen.
• [C-1-2] MUST report touch event with the action code that specifies the state change that occurs on the pointer going down or up on the screen .
• [C-1-3] MUST support pointer down and up on an object on the screen, which allows users to emulate tap on an object on the screen.
• [C-1-4] MUST support pointer down, pointer up, pointer down then pointer up in the same place on an object on the screen within a time threshold, which allows users to emulate double tap on an object on the screen.
• [C-1-5] MUST support pointer down on an arbitrary point on the screen, pointer move to any other arbitrary point on the screen, followed by a pointer up, which allows users to emulate a touch drag.
• [C-1-6] MUST support pointer down then allow users to quickly move the object to a different position on the screen and then pointer up on the screen, which allows users to fling an object on the screen.

If device implementations declare support for android.hardware.faketouch.multitouch.distinct , they:

• [C-2-1] MUST declare support for android.hardware.faketouch .
• [C-2-2] MUST support distinct tracking of two or more independent pointer inputs.

If device implementations declare support for android.hardware.faketouch.multitouch.jazzhand , they:

• [C-3-1] MUST declare support for android.hardware.faketouch .
• [C-3-2] MUST support distinct tracking of 5 (tracking a hand of fingers) or more pointer inputs fully independently.

7.2.6. Game Controller Support

7.2.6.1. Button Mappings

پیاده سازی دستگاه:

• [C-1-1] MUST be capable to map HID events to the corresponding InputEvent constants as listed in the below tables. The upstream Android implementation satisfies this requirement.

If device implementations embed a controller or ship with a separate controller in the box that would provide means to input all the events listed in the below tables, they:

• [C-2-1] MUST declare the feature flag android.hardware.gamepad

1 KeyEvent

2 The above HID usages must be declared within a Game pad CA (0x01 0x0005).

3 This usage must have a Logical Minimum of 0, a Logical Maximum of 7, a Physical Minimum of 0, a Physical Maximum of 315, Units in Degrees, and a Report Size of 4. The logical value is defined to be the clockwise rotation away from the vertical axis; for example, a logical value of 0 represents no rotation and the up button being pressed, while a logical value of 1 represents a rotation of 45 degrees and both the up and left keys being pressed.

4 MotionEvent

1 MotionEvent

7.2.7. کنترل از راه دور

See Section 2.3.1 for device-specific requirements.

7.3. حسگرها

If device implementations include a particular sensor type that has a corresponding API for third-party developers, the device implementation MUST implement that API as described in the Android SDK documentation and the Android Open Source documentation on sensors .

پیاده سازی دستگاه:

• [C-0-1] MUST accurately report the presence or absence of sensors per the android.content.pm.PackageManager class.
• [C-0-2] MUST return an accurate list of supported sensors via the SensorManager.getSensorList() and similar methods.
• [C-0-3] MUST behave reasonably for all other sensor APIs (for example, by returning true or false as appropriate when applications attempt to register listeners, not calling sensor listeners when the corresponding sensors are not present; etc.).

If device implementations include a particular sensor type that has a corresponding API for third-party developers, they:

• [C-1-1] MUST report all sensor measurements using the relevant International System of Units (metric) values for each sensor type as defined in the Android SDK documentation.
• [C-1-2] MUST report sensor data with a maximum latency of 100 milliseconds + 2 * sample_time for the case of a sensor stream with a maximum requested latency of 0 ms when the application processor is active. This delay does not include any filtering delays.
• [C-1-3] MUST report the first sensor sample within 400 milliseconds + 2 * sample_time of the sensor being activated. It is acceptable for this sample to have an accuracy of 0.
• [C-1-4] For any API indicated by the Android SDK documentation to be a continuous sensor , device implementations MUST continuously provide periodic data samples that SHOULD have a jitter below 3%, where jitter is defined as the standard deviation of the difference of the reported timestamp values between consecutive events.
• [C-1-5] MUST ensure that the sensor event stream MUST NOT prevent the device CPU from entering a suspend state or waking up from a suspend state.
• [C-1-6] MUST report the event time in nanoseconds as defined in the Android SDK documentation, representing the time the event happened and synchronized with the SystemClock.elapsedRealtimeNano() clock.
• [C-SR-1] Are STRONGLY RECOMMENDED to have timestamp synchronization error below 100 milliseconds, and SHOULD have timestamp synchronization error below 1 millisecond.
• When several sensors are activated, the power consumption SHOULD NOT exceed the sum of the individual sensor's reported power consumption.

The list above is not comprehensive; the documented behavior of the Android SDK and the Android Open Source Documentations on sensors is to be considered authoritative.

If device implementations include a particular sensor type that has a corresponding API for third-party developers, they:

• [C-1-6] MUST set a non-zero resolution for all sensors, and report the value via the Sensor.getResolution() API method.

Some sensor types are composite, meaning they can be derived from data provided by one or more other sensors. (Examples include the orientation sensor and the linear acceleration sensor.)

پیاده سازی دستگاه:

• SHOULD implement these sensor types, when they include the prerequisite physical sensors as described in sensor types .

If device implementations include a composite sensor, they:

• [C-2-1] MUST implement the sensor as described in the Android Open Source documentation on composite sensors .

If device implementations include a particular sensor type that has a corresponding API for third-party developers and the sensor only reports one value, then device implementations:

• [C-3-1] MUST set the resolution to 1 for the sensor and report the value via the Sensor.getResolution() API method.

If device implementations include a particular sensor type which supports SensorAdditionalInfo#TYPE_VEC3_CALIBRATION and the sensor is exposed to third-party developers, they:

• [C-4-1] MUST NOT include any fixed, factory-determined calibration parameters in the data provided.

If device implementations include a combination of 3-axis accelerometer, a 3-axis gyroscope sensor, or a magnetometer sensor, they are:

• [C-SR-2] STRONGLY RECOMMENDED to ensure the accelerometer, gyroscope and magnetometer have a fixed relative position, such that if the device is transformable (eg foldable), the sensor axes remain aligned and consistent with the sensor coordinate system throughout all possible device transformation states.

7.3.1. شتاب سنج

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to include a 3-axis accelerometer.

If device implementations include an accelerometer, they:

• [C-1-1] MUST be able to report events up to a frequency of at least 50 Hz.
• [C-1-3] MUST comply with the Android sensor coordinate system as detailed in the Android APIs.
• [C-1-4] MUST be capable of measuring from freefall up to four times the gravity(4g) or more on any axis.
• [C-1-5] MUST have a resolution of at least 12-bits.
• [C-1-6] MUST have a standard deviation no greater than 0.05 m/s^, where the standard deviation should be calculated on a per axis basis on samples collected over a period of at least 3 seconds at the fastest sampling rate.
• SHOULD report events up to at least 200 Hz.
• SHOULD have a resolution of at least 16-bits.
• SHOULD be calibrated while in use if the characteristics changes over the life cycle and compensated, and preserve the compensation parameters between device reboots.
• SHOULD be temperature compensated.

If device implementations include a 3-axis accelerometer, they:

• [C-2-1] MUST implement and report TYPE_ACCELEROMETER sensor.
• [C-SR-4] Are STRONGLY RECOMMENDED to implement the TYPE_SIGNIFICANT_MOTION composite sensor.
• [C-SR-5] Are STRONGLY RECOMMENDED to implement and report TYPE_ACCELEROMETER_UNCALIBRATED sensor. Android devices are STRONGLY RECOMMENDED to meet this requirement so they will be able to upgrade to the future platform release where this might become REQUIRED.
• SHOULD implement the TYPE_SIGNIFICANT_MOTION , TYPE_TILT_DETECTOR , TYPE_STEP_DETECTOR , TYPE_STEP_COUNTER composite sensors as described in the Android SDK document.

If device implementations include an accelerometer with less than 3 axes, they:

• [C-3-1] MUST implement and report TYPE_ACCELEROMETER_LIMITED_AXES sensor.
• [C-SR-6] Are STRONGLY_RECOMMENDED to implement and report TYPE_ACCELEROMETER_LIMITED_AXES_UNCALIBRATED sensor.

If device implementations include a 3-axis accelerometer and any of the TYPE_SIGNIFICANT_MOTION , TYPE_TILT_DETECTOR , TYPE_STEP_DETECTOR , TYPE_STEP_COUNTER composite sensors are implemented:

• [C-4-1] The sum of their power consumption MUST always be less than 4 mW.
• SHOULD each be below 2 mW and 0.5 mW for when the device is in a dynamic or static condition.

If device implementations include a 3-axis accelerometer and a 3-axis gyroscope sensor, they:

• [C-5-1] MUST implement the TYPE_GRAVITY and TYPE_LINEAR_ACCELERATION composite sensors.
• [C-SR-7] Are STRONGLY RECOMMENDED to implement the TYPE_GAME_ROTATION_VECTOR composite sensor.

If device implementations include a 3-axis accelerometer, a 3-axis gyroscope sensor, and a magnetometer sensor, they:

• [C-6-1] MUST implement a TYPE_ROTATION_VECTOR composite sensor.

7.3.2. مغناطیس سنج

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to include a 3-axis magnetometer (compass).

If device implementations include a 3-axis magnetometer, they:

• [C-1-1] MUST implement the TYPE_MAGNETIC_FIELD sensor.
• [C-1-2] MUST be able to report events up to a frequency of at least 10 Hz and SHOULD report events up to at least 50 Hz.
• [C-1-3] MUST comply with the Android sensor coordinate system as detailed in the Android APIs.
• [C-1-4] MUST be capable of measuring between -900 µT and +900 µT on each axis before saturating.
• [C-1-5] MUST have a hard iron offset value less than 700 µT and SHOULD have a value below 200 µT, by placing the magnetometer far from dynamic (current-induced) and static (magnet-induced) magnetic fields.
• [C-1-6] MUST have a resolution equal or denser than 0.6 µT.
• [C-1-7] MUST support online calibration and compensation of the hard iron bias, and preserve the compensation parameters between device reboots.
• [C-1-8] MUST have the soft iron compensation applied—the calibration can be done either while in use or during the production of the device.
• [C-1-9] MUST have a standard deviation, calculated on a per axis basis on samples collected over a period of at least 3 seconds at the fastest sampling rate, no greater than 1.5 µT; SHOULD have a standard deviation no greater than 0.5 µT.
• [C-1-10] MUST implement the TYPE_MAGNETIC_FIELD_UNCALIBRATED sensor.

If device implementations include a 3-axis magnetometer, an accelerometer sensor, and a 3-axis gyroscope sensor, they:

• [C-2-1] MUST implement a TYPE_ROTATION_VECTOR composite sensor.

If device implementations include a 3-axis magnetometer, an accelerometer, they:

• MAY implement the TYPE_GEOMAGNETIC_ROTATION_VECTOR sensor.

If device implementations include a 3-axis magnetometer, an accelerometer and TYPE_GEOMAGNETIC_ROTATION_VECTOR sensor, they:

• [C-3-1] MUST consume less than 10 mW.
• SHOULD consume less than 3 mW when the sensor is registered for batch mode at 10 Hz.

7.3.3. جی پی اس

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to include a GPS/GNSS receiver.

If device implementations include a GPS/GNSS receiver and report the capability to applications through the android.hardware.location.gps feature flag, they:

• [C-1-1] MUST support location outputs at a rate of at least 1 Hz when requested via LocationManager#requestLocationUpdate .
• [C-1-2] MUST be able to determine the location in open-sky conditions (strong signals, negligible multipath, HDOP < 2) within 10 seconds (fast time to first fix), when connected to a 0.5 Mbps or faster data speed internet connection. This requirement is typically met by the use of some form of Assisted or Predicted GPS/GNSS technique to minimize GPS/GNSS lock-on time (Assistance data includes Reference Time, Reference Location and Satellite Ephemeris/Clock).
  • [C-1-6] After making such a location calculation, device implementations MUST determine its location, in open sky, within 5 seconds, when location requests are restarted, up to an hour after the initial location calculation, even when the subsequent request is made without a data connection, and/or after a power cycle.

• In open sky conditions after determining the location, while stationary or moving with less than 1 meter per second squared of acceleration:

  • [C-1-3] MUST be able to determine location within 20 meters, and speed within 0.5 meters per second, at least 95% of the time.
  • [C-1-4] MUST simultaneously track and report via GnssStatus.Callback at least 8 satellites from one constellation.
  • SHOULD be able to simultaneously track at least 24 satellites, from multiple constellations (eg GPS + at least one of Glonass, Beidou, Galileo).

• [C-SR-2] Are STRONGLY RECOMMENDED to continue to deliver normal GPS/GNSS location outputs through GNSS Location Provider API's during an emergency phone call.

• [C-SR-3] Are STRONGLY RECOMMENDED to report GNSS measurements from all constellations tracked (as reported in GnssStatus messages), with the exception of SBAS.

• [C-SR-4] Are STRONGLY RECOMMENDED to report AGC, and Frequency of GNSS measurement.

• [C-SR-5] Are STRONGLY RECOMMENDED to report all accuracy estimates (including Bearing, Speed, and Vertical) as part of each GPS/GNSS location.

• [C-SR-6] Are STRONGLY RECOMMENDED to report GNSS measurements, as soon as they are found, even if a location calculated from GPS/GNSS is not yet reported.

• [C-SR-7] Are STRONGLY RECOMMENDED to report GNSS pseudoranges and pseudorange rates, that, in open-sky conditions after determining the location, while stationary or moving with less than 0.2 meter per second squared of acceleration, are sufficient to calculate position within 20 meters, and speed within 0.2 meters per second, at least 95% of the time.

7.3.4. ژیروسکوپ

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to include a gyroscope sensor.

If device implementations include a gyroscope, they:

• [C-1-1] MUST be able to report events up to a frequency of at least 50 Hz.
• [C-1-4] MUST have a resolution of 12-bits or more.
• [C-1-5] MUST be temperature compensated.
• [C-1-6] MUST be calibrated and compensated while in use, and preserve the compensation parameters between device reboots.
• [C-1-7] MUST have a variance no greater than 1e-7 rad^2 / s^2 per Hz (variance per Hz, or rad^2 / s). The variance is allowed to vary with the sampling rate, but MUST be constrained by this value. In other words, if you measure the variance of the gyro at 1 Hz sampling rate it SHOULD be no greater than 1e-7 rad^2/s^2.
• [C-SR-2] Calibration error is STRONGLY RECOMMENDED to be less than 0.01 rad/s when device is stationary at room temperature.
• [C-SR-3] Are STRONGLY RECOMMENDED to have a resolution of 16-bits or more.
• SHOULD report events up to at least 200 Hz.

If device implementations include a 3-axis gyroscope, they:

• [C-2-1] MUST implement the TYPE_GYROSCOPE sensor.
• [C-SR-4] Are Strongly Recommended to implement TYPE_GYROSCOPE_UNCALIBRATED sensor.

If device implementations include a gyroscope with less than 3 axes, they:

• [C-3-1] MUST implement and report TYPE_GYROSCOPE_LIMITED_AXES sensor.
• [C-SR-5] Are STRONGLY_RECOMMENDED to implement and report TYPE_GYROSCOPE_LIMITED_AXES_UNCALIBRATED sensor.

If device implementations include a 3-axis gyroscope, an accelerometer sensor and a magnetometer sensor, they:

• [C-4-1] MUST implement a TYPE_ROTATION_VECTOR composite sensor.

If device implementations include a 3-axis accelerometer and a 3-axis gyroscope sensor, they:

• [C-5-1] MUST implement the TYPE_GRAVITY and TYPE_LINEAR_ACCELERATION composite sensors.
• [C-SR-6] Are STRONGLY RECOMMENDED to implement the TYPE_GAME_ROTATION_VECTOR composite sensor.

7.3.5. فشارسنج

پیاده سازی دستگاه:

• [C-SR-1] Are STRONGLY RECOMMENDED to include a barometer (ambient air pressure sensor).

If device implementations include a barometer, they:

• [C-1-1] MUST implement and report TYPE_PRESSURE sensor.
• [C-1-2] MUST be able to deliver events at 5 Hz or greater.
• [C-1-3] MUST be temperature compensated.
• [C-SR-2] STRONGLY RECOMMENDED to be able to report pressure measurements in the range 300hPa to 1100hPa.
• SHOULD have an absolute accuracy of 1hPa.
• SHOULD have a relative accuracy of 0.12hPa over 20hPa range (equivalent to ~1m accuracy over ~200m change at sea level).

7.3.6. دماسنج

If device implementations include an ambient thermometer (temperature sensor), they:

• [C-1-1] MUST define SENSOR_TYPE_AMBIENT_TEMPERATURE for the ambient temperature sensor and the sensor MUST measure the ambient (room/vehicle cabin) temperature from where the user is interacting with the device in degrees Celsius.

If device implementations include a thermometer sensor that measures a temperature other than ambient temperature, such as CPU temperature, they:

• [C-2-1] MUST NOT define SENSOR_TYPE_AMBIENT_TEMPERATURE for the temperature sensor.

If device implementations include a sensor for monitoring skin temperature, then they:

• [C-SR-1] Are STRONGLY RECOMMENDED to support the PowerManager.getThermalHeadroom API.

7.3.7. فتومتر

• Device implementations MAY include a photometer (ambient light sensor).

7.3.8. سنسور مجاورت

• Device implementations MAY include a proximity sensor.

If device implementations include a proximity sensor and they report only a binary “near” or “far” reading, they:

• [C-1-1] MUST measure the proximity of an object in the same direction as the screen. That is, the proximity sensor MUST be oriented to detect objects close to the screen, as the primary intent of this sensor type is to detect a phone in use by the user. If device implementations include a proximity sensor with any other orientation, it MUST NOT be accessible through this API.
• [C-1-2] MUST have 1-bit of accuracy or more.
• [C-1-3] MUST use 0 centimeters as the near reading and 5 centimeters as the far reading.
• [C-1-4] MUST report a maximum range and resolution of 5.

7.3.9. High Fidelity Sensors

If device implementations include a set of higher quality sensors as defined in this section, and make available them to third-party apps, they:

• [C-1-1] MUST identify the capability through the android.hardware.sensor.hifi_sensors feature flag.

If device implementations declare android.hardware.sensor.hifi_sensors , they:

• [C-2-1] MUST have a TYPE_ACCELEROMETER sensor which:

  • MUST have a measurement range between at least -8g and +8g, and is STRONGLY RECOMMENDED to have a measurement range between at least -16g and +16g.
  • MUST have a measurement resolution of at least 2048 LSB/g.
  • MUST have a minimum measurement frequency of 12.5 Hz or lower.
  • MUST have a maximum measurement frequency of 400 Hz or higher; SHOULD support the SensorDirectChannel RATE_VERY_FAST .
  • MUST have a measurement noise not above 400 μg/√Hz.
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 3000 sensor events.
  • MUST have a batching power consumption not worse than 3 mW.
  • [C-SR-1] Is STRONGLY RECOMMENDED to have 3dB measurement bandwidth of at least 80% of Nyquist frequency, and white noise spectrum within this bandwidth.
  • SHOULD have an acceleration random walk less than 30 μg √Hz tested at room temperature.
  • SHOULD have a bias change vs. temperature of ≤ +/- 1 mg/°C.
  • SHOULD have a best-fit line non-linearity of ≤ 0.5%, and sensitivity change vs. temperature of ≤ 0.03%/C°.
  • SHOULD have cross-axis sensitivity of < 2.5 % and variation of cross-axis sensitivity < 0.2% in device operation temperature range.

• [C-2-2] MUST have a TYPE_ACCELEROMETER_UNCALIBRATED with the same quality requirements as TYPE_ACCELEROMETER .

• [C-2-3] MUST have a TYPE_GYROSCOPE sensor which:

  • MUST have a measurement range between at least -1000 and +1000 dps.
  • MUST have a measurement resolution of at least 16 LSB/dps.
  • MUST have a minimum measurement frequency of 12.5 Hz or lower.
  • MUST have a maximum measurement frequency of 400 Hz or higher; SHOULD support the SensorDirectChannel RATE_VERY_FAST .
  • MUST have a measurement noise not above 0.014°/s/√Hz.
  • [C-SR-2] Is STRONGLY RECOMMENDED to have 3dB measurement bandwidth of at least 80% of Nyquist frequency, and white noise spectrum within this bandwidth.
  • SHOULD have a rate random walk less than 0.001 °/s √Hz tested at room temperature.
  • SHOULD have a bias change vs. temperature of ≤ +/- 0.05 °/ s / °C.
  • SHOULD have a sensitivity change vs. temperature of ≤ 0.02% / °C.
  • SHOULD have a best-fit line non-linearity of ≤ 0.2%.
  • SHOULD have a noise density of ≤ 0.007 °/s/√Hz.
  • SHOULD have calibration error less than 0.002 rad/s in temperature range 10 ~ 40 ℃ when device is stationary.
  • SHOULD have g-sensitivity less than 0.1°/s/g.
  • SHOULD have cross-axis sensitivity of < 4.0 % and cross-axis sensitivity variation < 0.3% in device operation temperature range.

• [C-2-4] MUST have a TYPE_GYROSCOPE_UNCALIBRATED with the same quality requirements as TYPE_GYROSCOPE .

• [C-2-5] MUST have a TYPE_GEOMAGNETIC_FIELD sensor which:

  • MUST have a measurement range between at least -900 and +900 μT.
  • MUST have a measurement resolution of at least 5 LSB/uT.
  • MUST have a minimum measurement frequency of 5 Hz or lower.
  • MUST have a maximum measurement frequency of 50 Hz or higher.
  • MUST have a measurement noise not above 0.5 uT.

• [C-2-6] MUST have a TYPE_MAGNETIC_FIELD_UNCALIBRATED with the same quality requirements as TYPE_GEOMAGNETIC_FIELD and in addition:

  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 600 sensor events.
  • [C-SR-3] Is STRONGLY RECOMMENDED to have white noise spectrum from 1 Hz to at least 10 Hz when the report rate is 50 Hz or higher.

• [C-2-7] MUST have a TYPE_PRESSURE sensor which:

  • MUST have a measurement range between at least 300 and 1100 hPa.
  • MUST have a measurement resolution of at least 80 LSB/hPa.
  • MUST have a minimum measurement frequency of 1 Hz or lower.
  • MUST have a maximum measurement frequency of 10 Hz or higher.
  • MUST have a measurement noise not above 2 Pa/√Hz.
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 300 sensor events.
  • MUST have a batching power consumption not worse than 2 mW.

• [C-2-8] MUST have a TYPE_GAME_ROTATION_VECTOR sensor.

• [C-2-9] MUST have a TYPE_SIGNIFICANT_MOTION sensor which:

  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.

• [C-2-10] MUST have a TYPE_STEP_DETECTOR sensor which:

  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 100 sensor events.
  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.
  • MUST have a batching power consumption not worse than 4 mW.

• [C-2-11] MUST have a TYPE_STEP_COUNTER sensor which:

  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.

• [C-2-12] MUST have a TILT_DETECTOR sensor which:

  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.

• [C-2-13] The event timestamp of the same physical event reported by the Accelerometer, Gyroscope, and Magnetometer MUST be within 2.5 milliseconds of each other. The event timestamp of the same physical event reported by the Accelerometer and Gyroscope SHOULD be within 0.25 milliseconds of each other.

• [C-2-14] MUST have Gyroscope sensor event timestamps on the same time base as the camera subsystem and within 1 milliseconds of error.

• [C-2-15] MUST deliver samples to applications within 5 milliseconds from the time when the data is available on any of the above physical sensors to the application.

• [C-2-16] MUST NOT have a power consumption higher than 0.5 mW when device is static and 2.0 mW when device is moving when any combination of the following sensors are enabled:

  • SENSOR_TYPE_SIGNIFICANT_MOTION
  • SENSOR_TYPE_STEP_DETECTOR
  • SENSOR_TYPE_STEP_COUNTER
  • SENSOR_TILT_DETECTORS

• [C-2-17] MAY have a TYPE_PROXIMITY sensor, but if present MUST have a minimum buffer capability of 100 sensor events.

Note that all power consumption requirements in this section do not include the power consumption of the Application Processor. It is inclusive of the power drawn by the entire sensor chain—the sensor, any supporting circuitry, any dedicated sensor processing system, etc.

If device implementations include direct sensor support, they:

• [C-3-1] MUST correctly declare support of direct channel types and direct report rates level through the isDirectChannelTypeSupported and getHighestDirectReportRateLevel API.
• [C-3-2] MUST support at least one of the two sensor direct channel types for all sensors that declare support for sensor direct channel.
  • TYPE_HARDWARE_BUFFER
  • TYPE_MEMORY_FILE
• SHOULD support event reporting through sensor direct channel for primary sensor (non-wakeup variant) of the following types:
  • TYPE_ACCELEROMETER
  • TYPE_ACCELEROMETER_UNCALIBRATED
  • TYPE_GYROSCOPE
  • TYPE_GYROSCOPE_UNCALIBRATED
  • TYPE_MAGNETIC_FIELD
  • TYPE_MAGNETIC_FIELD_UNCALIBRATED

7.3.10. Biometric Sensors

For additional background on Measuring Biometric Unlock Security, please see Measuring Biometric Security documentation .

If device implementations include a secure lock screen, they:

• SHOULD include a biometric sensor

Biometric sensors can be classified as Class 3 (formerly Strong ), Class 2 (formerly Weak ), or Class 1 (formerly Convenience ) based on their spoof and imposter acceptance rates, and on the security of the biometric pipeline. This classification determines the capabilities the biometric sensor has to interface with the platform and with third-party applications. Sensors need to meet additional requirements as detailed below if they wish to be classified as either Class 1 , Class 2 or Class 3 . Both Class 2 and Class 3 biometrics get additional capabilities as detailed below.

If device implementations make a biometric sensor available to third-party applications via android.hardware.biometrics.BiometricManager , android.hardware.biometrics.BiometricPrompt , and android.provider.Settings.ACTION_BIOMETRIC_ENROLL , they:

• [C-4-1] MUST meet the requirements for Class 3 or Class 2 biometric as defined in this document.
• [C-4-2] MUST recognize and honor each parameter name defined as a constant in the Authenticators class and any combinations thereof. Conversely, MUST NOT honor or recognize integer constants passed to the canAuthenticate(int) and setAllowedAuthenticators(int) methods other than those documented as public constants in Authenticators and any combinations thereof.
• [C-4-3] MUST implement the ACTION_BIOMETRIC_ENROLL action on devices that have either Class 3 or Class 2 biometrics. This action MUST only present the enrollment entry points for Class 3 or Class 2 biometrics.

If device implementations support passive biometrics, they:

• [C-5-1] MUST by default require an additional confirmation step (eg a button press).
• [C-SR-1] Are STRONGLY RECOMMENDED to have a setting to allow users to override application preference and always require accompanying confirmation step.
• [C-SR-2] Are STRONGLY RECOMMENDED to have the confirm action be secured such that an operating system or kernel compromise cannot spoof it. For example, this means that the confirm action based on a physical button is routed through an input-only general-purpose input/output (GPIO) pin of a secure element (SE) that cannot be driven by any other means than a physical button را فشار دهید.
• [C-5-2] MUST additionally implement an implicit authentication flow (without confirmation step) corresponding to setConfirmationRequired(boolean) , which applications can set to utilize for sign-in flows.

If device implementations have multiple biometric sensors, they:

• [C-SR-3] Are STRONGLY RECOMMENDED to require only one biometric be confirmed per authentication (eg if both fingerprint and face sensors are available on the device, onAuthenticationSucceeded should be sent after any one of them is confirmed).

In order for device implementations to allow access to keystore keys to third-party applications, they:

• [C-6-1] MUST meet the requirements for Class 3 as defined in this section below.
• [C-6-2] MUST present only Class 3 biometrics when the authentication requires BIOMETRIC_STRONG , or the authentication is invoked with a CryptoObject .

If device implementations wish to treat a biometric sensor as Class 1 (formerly Convenience ), they:

• [C-1-1] MUST have a false acceptance rate less than 0.002%.
• [C-1-2] MUST disclose that this mode may be less secure than a strong PIN, pattern, or password and clearly enumerate the risks of enabling it, if the spoof and imposter acceptance rates are higher than 7% as measured by the Android Biometrics Test Protocols .
• [C-1-9] MUST challenge the user for the recommended primary authentication (eg PIN, pattern, password) after no more than twenty false trials and no less than ninety-second backoff time for biometric verification - where a false trial is one with an adequate capture quality (BIOMETRIC_ACQUIRED_GOOD) that does not match an enrolled biometric.
• [C-SR-4] Are STRONGLY RECOMMENDED to lower the total number of false trials for biometric verification specified in [C-1-9] if the spoof and imposter acceptance rates are higher than 7% as measure by the Android Biometrics Test Protocols .
• [C-1-3] MUST rate limit attempts for biometric verification - where a false trial is one with an adequate capture quality ( BIOMETRIC_ACQUIRED_GOOD ) that does not match an enrolled biometric.
• [C-SR-5] Are STRONGLY RECOMMENDED to rate limit attempts for at least 30 seconds after five false trials for biometric verification for the maximum number of false trials per [C-1-9] - where a false trial is one with an adequate capture quality (BIOMETRIC_ACQUIRED_GOOD) that does not match an enrolled biometric.
• [C-SR-6] Are STRONGLY RECOMMENDED to have all rate limiting logic in TEE.
• [C-1-10] MUST disable biometrics once primary authentication backoff has first triggered as described in [C-0-2] of section 9.11.
• [C-1-11] MUST have a spoof and imposter acceptance rate not higher than 30%, with (1) a spoof and imposter acceptance rate for Level A presentation attack instrument (PAI) species not higher than 30%, and (2) a spoof and imposter acceptance rate of Level B PAI species not higher than 40%, as measured by the Android Biometrics Test Protocols.
• [C-1-4] MUST prevent adding new biometrics without first establishing a chain of trust by having the user confirm existing or add a new device credential (PIN/pattern/password) that's secured by TEE; the Android Open Source Project implementation provides the mechanism in the framework to do so.
• [C-1-5] MUST completely remove all identifiable biometric data for a user when the user's account is removed (including via a factory reset).
• [C-1-6] MUST honor the individual flag for that biometric (ie DevicePolicyManager.KEYGUARD_DISABLE_FINGERPRINT , DevicePolicymanager.KEYGUARD_DISABLE_FACE , or DevicePolicymanager.KEYGUARD_DISABLE_IRIS ).
• [C-1-7] MUST challenge the user for the recommended primary authentication (eg PIN, pattern, password) once every 24 hours or less. Note: Upgrading devices launched on Android version 9 or earlier MUST challenge the user for the recommended primary authentication (eg PIN, pattern, password) once every 72 hours or less.
• [C-1-8] MUST challenge the user for the recommended primary authentication (eg: PIN, pattern, password) or Class 3 (STRONG) biometric after one of the following:
  • a 4-hour idle timeout period, OR
  • 3 failed biometric authentication attempts.
  • The idle timeout period and the failed authentication count is reset after any successful confirmation of the device credentials. Note: Upgrading devices launched on Android version 9 or earlier MAY be exempted from C-1-8.
• [C-SR-7] Are STRONGLY RECOMMENDED to use the logic in the framework provided by the Android Open Source Project to enforce constraints specified in [C-1-7] and [C-1-8] for new devices.
• [C-SR-8] Are STRONGLY RECOMMENDED to have a false rejection rate of less than 10%, as measured on the device.
• [C-SR-9] Are STRONGLY RECOMMENDED to have a latency below 1 second, measured from when the biometric is detected, until the screen is unlocked, for each enrolled biometric.

If device implementations wish to treat a biometric sensor as Class 2 (formerly Weak ), they:

• [C-2-1] MUST meet all requirements for Class 1 above.

• [C-2-2] MUST have a spoof and imposter acceptance rate not higher than 20%, with (1) a spoof and imposter acceptance rate for Level A presentation attack instrument (PAI) species not higher than 20%, and (2) a spoof and imposter acceptance rate of Level B PAI species not higher than 30%, as measured by the Android Biometrics Test Protocols .

• [C-2-3] MUST perform the biometric matching in an isolated execution environment outside Android user or kernel space, such as the Trusted Execution Environment (TEE), or on a chip with a secure channel to the isolated execution environment.

• [C-2-4] MUST have all identifiable data encrypted and cryptographically authenticated such that they cannot be acquired, read or altered outside of the isolated execution environment or a chip with a secure channel to the isolated execution environment as documented in the implementation guidelines on the Android Open Source Project site.

• [C-2-5] For camera based biometrics, while biometric based authentication or enrollment is happening:

  • MUST operate the camera in a mode that prevents camera frames from being read or altered outside the isolated execution environment or a chip with a secure channel to the isolated execution environment.
  • برای راه‌حل‌های تک دوربینی RGB، فریم‌های دوربین می‌توانند در خارج از محیط اجرای ایزوله قابل خواندن باشند تا از عملیات‌هایی مانند پیش‌نمایش برای ثبت‌نام پشتیبانی کنند، اما همچنان نباید قابل تغییر باشند.

• [C-2-6] MUST NOT enable third-party applications to distinguish between individual biometric enrollments.

• [C-2-7] MUST NOT allow unencrypted access to identifiable biometric data or any data derived from it (such as embeddings) to the Application Processor outside the context of the TEE. Upgrading devices launched on Android version 9 or earlier are not exempted from C-2-7.

• [C-2-8] MUST have a secure processing pipeline such that an operating system or kernel compromise cannot allow data to be directly injected to falsely authenticate as the user. Note: If device implementations are already launched on Android version 9 or earlier and cannot meet the requirement C-2-8 through a system software update, they MAY be exempted from the requirement.

• [C-SR-10] Are STRONGLY RECOMMENDED to include liveness detection for all biometric modalities and attention detection for Face biometrics.

• [C-2-9] MUST make the biometric sensor available to third-party applications.

If device implementations wish to treat a biometric sensor as Class 3 (formerly Strong ), they:

• [C-3-1] MUST meet all the requirements of Class 2 above, except for [C-1-7] and [C-1-8].
• [C-3-2] MUST have a hardware-backed keystore implementation.
• [C-3-3] MUST have a spoof and imposter acceptance rate not higher than 7%, with (1) a spoof and imposter acceptance rate for Level A presentation attack instrument (PAI) species not higher than 7%, and (2) a spoof and imposter acceptance rate of Level B PAI species not higher than 20%, as measured by the Android Biometrics Test Protocols .
• [C-3-4] MUST challenge the user for the recommended primary authentication (eg PIN, pattern, password) once every 72 hours or less.
• [C-3-5] MUST re-generate Authenticator ID for all Class 3 biometrics supported on device if any of them is re-enrolled.
• [C-3-6] Must enable biometric-backed keystore keys to third-party applications.

If device implementations contain an under-display fingerprint sensor (UDFPS), they:

• [C-SR-11] Are STRONGLY RECOMMENDED to prevent the touchable area of the UDFPS from interfering with 3-button navigation( which some users might require for accessibility purposes).

7.3.11. Pose Sensor

پیاده سازی دستگاه:

• MAY support pose sensor with 6 degrees of freedom.

If device implementations support pose sensor with 6 degrees of freedom, they:

• [C-1-1] MUST implement and report TYPE_POSE_6DOF sensor.
• [C-1-2] MUST be more accurate than the rotation vector alone.

7.3.12. Hinge Angle Sensor

If device implementations support a hinge angle sensor, they:

• [C-1-1] MUST implement and report TYPE_HINGLE_ANGLE .
• [C-1-2] MUST support at least two readings between 0 and 360 degrees (inclusive ie including 0 and 360 degrees).
• [C-1-3] MUST return a wakeup sensor for getDefaultSensor(SENSOR_TYPE_HINGE_ANGLE) .

7.3.13. IEEE 802.1.15.4 [Moved to 7.4.9]

7.4. Data Connectivity

7.4.1. تلفن

“Telephony” as used by the Android APIs and this document refers specifically to hardware related to placing voice calls and sending SMS messages via a GSM or CDMA network. While these voice calls may or may not be packet-switched, they are for the purposes of Android considered independent of any data connectivity that may be implemented using the same network. In other words, the Android “telephony” functionality and APIs refer specifically to voice calls and SMS. For instance, device implementations that cannot place calls or send/receive SMS messages are not considered a telephony device, regardless of whether they use a cellular network for data connectivity.

• Android MAY be used on devices that do not include telephony hardware. That is, Android is compatible with devices that are not phones.

If device implementations include GSM or CDMA telephony, they:

• [C-1-1] MUST declare the android.hardware.telephony feature flag and other sub-feature flags according to the technology.
• [C-1-2] MUST implement full support for the API for that technology.
• SHOULD allow all available cellular service types (2G, 3G, 4G, 5G, etc.) during emergency calls (regardless of the network types set by SetAllowedNetworkTypeBitmap() ).

If device implementations do not include telephony hardware, they:

• [C-2-1] MUST implement the full APIs as no-ops.

If device implementations support eUICCs or eSIMs/embedded SIMs and include a proprietary mechanism to make eSIM functionality available for third-party developers, they:

• [C-3-1] MUST declare the android.hardware.telephony.euicc feature flag.

If device implementations don't set the system property ro.telephony.iwlan\_operation\_mode to 'legacy', then they:

• [C-4-1] MUST NOT report ' NETWORK_TYPE_IWLAN ' via NetworkRegistrationInfo#getAccessNetworkTechnology() when NetworkRegistrationInfo#getTransportType() is reported as ' TRANSPORT_TYPE_WWAN ' for the same NetworkRegistrationInfo instance.

If device implementations support a single IP Multimedia Subsystem (IMS) registration for both multimedia telephony service (MMTEL) and rich communication service (RCS) features and are expected to comply with cellular carrier requirements regarding using a single IMS registration for all IMS signalling traffic, they:

• [C-5-1] MUST declare the android.hardware.telephony.ims feature flag and provide a complete implementation of the ImsService API for both MMTEL and RCS User Capability Exchange API .
• [C-5-2] MUST declare the android.hardware.telephony.ims.singlereg feature flag and provide a complete implementation of the SipTransport API , the GbaService API , dedicated bearer indications using the IRadio 1.6 HAL, and provisioning via Auto Configuration Server (ACS) or other proprietary provisioning mechanism using the IMS Configuration API .

If device implementations report the android.hardware.telephony feature, then:

• [C-6-1] The SmsManager#sendTextMessage and SmsManager#sendMultipartTextMessage MUST result in corresponding calls to CarrierMessagingService for providing text messaging functionality. SmsManager#sendMultimediaMessage and SmsManager#downloadMultimediaMessage MUST result in corresponding calls to CarrierMessagingService for providing multimedia messaging functionality.
• [C-6-2] The application designated by android.provider.Telephony.Sms#getDefaultSmsPackage MUST use SmsManager APIs when sending and receiving SMS and MMS messages. The AOSP reference implementation in packages/apps/Messaging meets this requirement.
• [C-6-3] The application which responds to Intent#ACTION_DIAL MUST support entry of arbitrary dialer codes formatted as *#*#CODE#*#* and trigger a corresponding TelephonyManager#ACTION_SECRET_CODE broadcast.
• [C-6-4] The application which responds to Intent#ACTION_DIAL MUST use VoicemailContract.Voicemails#TRANSCRIPTION to display visual voicemail transcription to users if it supports visual voicemail transcriptions.
• [C-6-5] MUST represent all SubscriptionInfo with equivalent group UUIDs as a single subscription in all user-visible affordances that display and control SIM card information. Examples of such affordances include settings interfaces that match Settings#ACTION_MANAGE_ALL_SIM_PROFILES_SETTINGS or EuiccManager#ACTION_MANAGE_EMBEDDED_SUBSCRIPTIONS .
• [C-6-6] MUST NOT display or allow control of any SubscriptionInfo with a non-null group UUID and opportunistic bit in any user-visible affordances that allow configuration or control of SIM card settings.

If the device implementations report the android.hardware.telephony feature and provide a system status bar, then:

• [C-7-1] MUST select a representative active subscription for a given group UUID to display to the user in any affordances that provide SIM status information. Examples of such affordances include the status bar cellular signal icon or quick settings tile.
• [C-SR-1] It is STRONGLY RECOMMENDED that the representative subscription is chosen to be the active data subscription unless the device is in a voice call, during which it is STRONGLY RECOMMENDED that the representative subscription is the active voice subscription.

If device implementations report the android.hardware.telephony feature, then:

• [C-6-7] MUST be capable of opening and concurrently utilizing the maximum number of logical channels (20 in total) for each UICC per ETSI TS 102 221.
• [C-6-8] MUST NOT apply any of the following behaviors to active carrier apps (as designated by TelephonyManager#getCarrierServicePackageName ) automatically or without explicit user confirmation:
  • Revoke or limit network access
  • Revoke permissions
  • Restrict background or foreground app execution beyond the existing power management features included in AOSP
  • Disable or uninstall the app

If device implementations report the android.hardware.telephony feature and all active, non-opportunistic subscriptions that share a group UUID are disabled, physically removed from the device, or marked opportunistic, then the device:

• [C-8-1] MUST automatically disable all remaining active opportunistic subscriptions in the same group.

If device implementations include GSM telephony but not CDMA telephony, they:

• [C-9-1] MUST NOT declare PackageManager#FEATURE_TELEPHONY_CDMA .
• [C-9-2] MUST throw an IllegalArgumentException upon attempts to set any 3GPP2 network types in preferred or allowed network type bitmasks.
• [C-9-3] MUST return an empty string from TelephonyManager#getMeid .

If the device implementations support eUICCs with multiple ports and profiles, they:

• [C-10-1] MUST declare the android.hardware.telephony.euicc.mep feature flag.

7.4.1.1. Number Blocking Compatibility

If device implementations report the android.hardware.telephony.calling feature, they:

• [C-1-1] MUST include number blocking support
• [C-1-2] MUST fully implement BlockedNumberContract and the corresponding API as described in the SDK documentation.

• [C-1-3] MUST block all calls and messages from a phone number in 'BlockedNumberProvider' without any interaction with apps. The only exception is when number blocking is temporarily lifted as described in the SDK documentation.

• [C-1-4] MUST write to the platform call log provider for a blocked call and MUST filter calls with BLOCKED_TYPE out of the default call log view in the pre-installed dialer app.

• [C-1-5] MUST NOT write to the Telephony provider for a blocked message.

• [C-1-6] MUST implement a blocked numbers management UI, which is opened with the intent returned by TelecomManager.createManageBlockedNumbersIntent() method.

• [C-1-7] MUST NOT allow secondary users to view or edit the blocked numbers on the device as the Android platform assumes the primary user to have full control of the telephony services, a single instance, on the device. All blocking related UI MUST be hidden for secondary users and the blocked list MUST still be respected.

• SHOULD migrate the blocked numbers into the provider when a device updates to Android 7.0.

• SHOULD provide a user affordance to show blocked calls in the pre-installed dialer app.

7.4.1.2. Telecom API

If device implementations report android.hardware.telephony.calling , they:

• [C-1-1] MUST support the ConnectionService APIs described in the SDK .
• [C-1-2] MUST display a new incoming call and provide user affordance to accept or reject the incoming call when the user is on an ongoing call that is made by a third-party app that does not support the hold feature specified via CAPABILITY_SUPPORT_HOLD .
• [C-1-3] MUST have an application that implements InCallService .

• [C-SR-1] Are STRONGLY RECOMMENDED to notify the user that answering an incoming call will drop an ongoing call.

  The AOSP implementation meets these requirements by a heads-up notification which indicates to the user that answering an incoming call will cause the other call to be dropped.

• [C-SR-2] Are STRONGLY RECOMMENDED to preload the default dialer app that shows a call log entry and the name of a third-party app in its call log when the third-party app sets the EXTRA_LOG_SELF_MANAGED_CALLS extras key on its PhoneAccount to true .

• [C-SR-3] Are STRONGLY RECOMMENDED to handle the audio headset's KEYCODE_MEDIA_PLAY_PAUSE and KEYCODE_HEADSETHOOK events for the android.telecom APIs as below:

  • Call Connection.onDisconnect() when a short press of the key event is detected during an ongoing call.
  • Call Connection.onAnswer() when a short press of the key event is detected during an incoming call.
  • Call Connection.onReject() when a long press of the key event is detected during an incoming call.
  • Toggle the mute status of the CallAudioState .

7.4.1.3. Cellular NAT-T Keepalive Offload

پیاده سازی دستگاه:

• SHOULD include support for Cellular keepalive offload.

If device implementations include support for Cellular keepalive offload and exposes the functionality to third-party apps, they:

• [C-1-1] MUST support the SocketKeepAlive API.
• [C-1-2] MUST support at least one concurrent keepalive slot over cellular.
• [C-1-3] MUST support as many concurrent cellular keepalive slots as are supported by the Cellular Radio HAL.
• [C-SR-1] Are STRONGLY RECOMMENDED to support at least three cellular keepalive slots per radio instance.

If device implementations do not include support for cellular keepalive offload, they:

• [C-2-1] MUST return ERROR_UNSUPPORTED.

7.4.2. IEEE 802.11 (Wi-Fi)

پیاده سازی دستگاه:

• SHOULD include support for one or more forms of 802.11.

If device implementations include support for 802.11 and expose the functionality to a third-party application, they:

• [C-1-1] MUST implement the corresponding Android API.
• [C-1-2] MUST report the hardware feature flag android.hardware.wifi .
• [C-1-3] MUST implement the multicast API as described in the SDK documentation.
• [C-1-4] MUST support multicast DNS (mDNS) and MUST NOT filter mDNS packets (224.0.0.251) at any time of operation including:
  • Even when the screen is not in an active state.
  • For Android Television device implementations, even when in standby power states.
• [C-1-5] MUST NOT treat the WifiManager.enableNetwork() API method call as a sufficient indication to switch the currently active Network that is used by default for application traffic and is returned by ConnectivityManager API methods such as getActiveNetwork and registerDefaultNetworkCallback . In other words, they MAY only disable the Internet access provided by any other network provider (eg mobile data) if they successfully validate that the Wi-Fi network is providing Internet access.
• [C-1-6] Are STRONGLY RECOMMENDED to, when the ConnectivityManager.reportNetworkConnectivity() API method is called, re-evaluate the Internet access on the Network and, once the evaluation determines that the current Network no longer provides Internet access, switch to any other available network (eg mobile data) that provides Internet access.
• [C-1-7] MUST randomize the source MAC address and sequence number of probe request frames, once at the beginning of each scan, while STA is disconnected.
• [C-1-8] MUST use one consistent MAC address (SHOULD NOT randomize MAC address halfway through a scan).
• [C-1-9] MUST iterate probe request sequence number as normal (sequentially) between the probe requests in a scan.
• [C-1-10] MUST randomize Probe request sequence number between the last probe request of a scan and the first probe request of the next scan.
• [C-SR-1] Are STRONGLY RECOMMENDED to randomize the source MAC address used for all STA communication to an Access Point (AP) while associating and associated.
  • The device MUST use a different randomized MAC address for each SSID (FQDN for Passpoint) it communicates with.
  • The device MUST provide the user with an option to control the randomization per SSID (FQDN for Passpoint) with non randomized and randomized options, and MUST set the default mode for new Wi-Fi configurations to be randomized.
• [C-SR-2] Are STRONGLY RECOMMENDED to use a random BSSID for any AP that they create.
  • The MAC address MUST be randomized and persisted per SSID used by the AP.
  • DEVICE ممکن است گزینه ای برای غیرفعال کردن این ویژگی در اختیار کاربر قرار دهد. اگر چنین گزینه ای ارائه شود، تصادفی سازی باید به طور پیش فرض فعال شود.

If device implementations include support for Wi-Fi power save mode as defined in IEEE 802.11 standard, they:

• SHOULD turn off Wi-Fi power save mode whenever an app acquires WIFI_MODE_FULL_HIGH_PERF lock or WIFI_MODE_FULL_LOW_LATENCY lock via WifiManager.createWifiLock() and WifiManager.WifiLock.acquire() APIs and the lock is active.
• [C-3-2] The average round trip latency between the device and an access point while the device is in a Wi-Fi Low Latency Lock ( WIFI_MODE_FULL_LOW_LATENCY ) mode MUST be smaller than the latency during a Wi-Fi High Perf Lock ( WIFI_MODE_FULL_HIGH_PERF ) mode.
• [C-SR-3] Are STRONGLY RECOMMENDED to minimize Wi-Fi round trip latency whenever a Low Latency Lock ( WIFI_MODE_FULL_LOW_LATENCY ) is acquired and takes effect.

If device implementations support Wi-Fi and use Wi-Fi for location scanning, they:

• [C-2-1] MUST provide a user affordance to enable/disable the value read through the WifiManager.isScanAlwaysAvailable API method.

7.4.2.1. وای فای دایرکت

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Direct (Wi-Fi peer-to-peer).

If device implementations include support for Wi-Fi Direct, they:

• [C-1-1] MUST implement the corresponding Android API as described in the SDK documentation.
• [C-1-2] MUST report the hardware feature android.hardware.wifi.direct .
• [C-1-3] MUST support regular Wi-Fi operation.
• [C-1-4] MUST support Wi-Fi and Wi-Fi Direct operations concurrently.
• [C-SR-1] Are STRONGLY RECOMMENDED to randomize the source MAC address for all newly formed Wi-Fi Direct connections.

7.4.2.2. Wi-Fi Tunneled Direct Link Setup

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Tunneled Direct Link Setup (TDLS) as described in the Android SDK Documentation.

If device implementations include support for TDLS and TDLS is enabled by the WiFiManager API, they:

• [C-1-1] MUST declare support for TDLS through WifiManager.isTdlsSupported .
• SHOULD use TDLS only when it is possible AND beneficial.
• SHOULD have some heuristic and NOT use TDLS when its performance might be worse than going through the Wi-Fi access point.

7.4.2.3. Wi-Fi Aware

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Aware .

If device implementations include support for Wi-Fi Aware and expose the functionality to third-party apps, then they:

• [C-1-1] MUST implement the WifiAwareManager APIs as described in the SDK documentation .
• [C-1-2] MUST declare the android.hardware.wifi.aware feature flag.
• [C-1-3] MUST support Wi-Fi and Wi-Fi Aware operations concurrently.
• [C-1-4] MUST randomize the Wi-Fi Aware management interface address at intervals no longer than 30 minutes and whenever Wi-Fi Aware is enabled unless an Aware ranging operation is ongoing or an Aware data-path is active (randomization is not expected for as long as the data-path is active).

If device implementations include support for Wi-Fi Aware and Wi-Fi Location as described in Section 7.4.2.5 and exposes these functionalities to third-party apps, then they:

• [C-2-1] MUST implement the location-aware discovery APIs: setRangingEnabled , setMinDistanceMm , setMaxDistanceMm , and onServiceDiscoveredWithinRange .

7.4.2.4. Wi-Fi Passpoint

If device implementations include support for 802.11 (Wi-Fi) they:

• [C-1-1] MUST include support for Wi-Fi Passpoint .
• [C-1-2] MUST implement the Passpoint related WifiManager APIs as described in the SDK documentation .
• [C-1-3] MUST support IEEE 802.11u standard, specifically related to Network Discovery and Selection, such as Generic Advertisement Service (GAS) and Access Network Query Protocol (ANQP).
• [C-1-4] MUST declare android.hardware.wifi.passpoint feature flag.
• [C-1-5] MUST follow the AOSP implementation to discover, match and associate to Passpoint networks.
• [C-1-6] MUST support at least the following subset of device provisioning protocols as defined in the Wi-Fi Alliance Passpoint R2: EAP-TTLS authentication and SOAP-XML.
• [C-1-7] MUST process the AAA server certificate as described in Hotspot 2.0 R3 specification.
• [C-1-8] MUST support user control of provisioning through the Wi-Fi picker.
• [C-1-9] MUST keep Passpoint configurations persistent across reboots.
• [C-SR-1] Are STRONGLY RECOMMENDED to support the terms and conditions acceptance feature.
• [C-SR-2] Are STRONGLY RECOMMENDED to support the Venue information feature.

If a global Passpoint disable user control switch is provided, implementations:

• [C-3-1] MUST enable Passpoint by default.

7.4.2.5. Wi-Fi Location (Wi-Fi Round Trip Time - RTT)

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Location .

If device implementations include support for Wi-Fi Location and expose the functionality to third-party apps, then they:

• [C-1-1] MUST implement the WifiRttManager APIs as described in the SDK documentation .
• [C-1-2] MUST declare the android.hardware.wifi.rtt feature flag.
• [C-1-3] MUST randomize the source MAC address for each RTT burst which is executed while the Wi-Fi interface on which the RTT is being executed is not associated to an Access Point.
• [C-1-4] MUST be accurate to within 2 meters at 80 MHz bandwidth at the 68th percentile (as calculated with the Cumulative Distribution Function).
• [C-SR-1] Are STRONGLY RECOMMENDED to report it accurately to within 1.5 meters at 80 MHz bandwidth at the 68th percentile (as calculated with the Cumulative Distribution Function).

7.4.2.6. Wi-Fi Keepalive Offload

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi keepalive offload.

If device implementations include support for Wi-Fi keepalive offload and expose the functionality to third-party apps, they:

• [C-1-1] MUST support the SocketKeepAlive API.
• [C-1-2] MUST support at least three concurrent keepalive slots over Wi-Fi.

If device implementations do not include support for Wi-Fi keepalive offload, they:

• [C-2-1] MUST return ERROR_UNSUPPORTED .

7.4.2.7. Wi-Fi Easy Connect (Device Provisioning Protocol)

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Easy Connect (DPP) .

If device implementations include support for Wi-Fi Easy Connect and expose the functionality to third-party apps, they:

• [C-1-1] MUST have the WifiManager#isEasyConnectSupported() method return true .

7.4.2.8. Enterprise Wi-Fi Server Certificate Validation

If the Wi-Fi server certificate is not validated or the Wi-Fi server domain name is not set, device implementations:

• [C-SR-1] Are STRONGLY RECOMMENDED not to provide the user an option to manually add Enterprise Wi-Fi network in the Settings app.

7.4.2.9. Trust On First Use (TOFU)

If device implementations support Trust on first usage (TOFU) and allow the user to define WPA/WPA2/WPA3-Enterprise configurations, then they:

• [C-4-1] MUST provide the user an option to select to use TOFU.

7.4.3. بلوتوث

If device implementations support Bluetooth Audio profile, they:

• SHOULD support Advanced Audio Codecs and Bluetooth Audio Codecs (eg LDAC) with A2DP.

If device implementations support HFP, A2DP and AVRCP, they:

• SHOULD support at least 5 total connected devices.

If device implementations declare android.hardware.vr.high_performance feature, they:

• [C-1-1] MUST support Bluetooth 4.2 and Bluetooth LE Data Length Extension.

Android includes support for Bluetooth and Bluetooth Low Energy .

If device implementations include support for Bluetooth and Bluetooth Low Energy, they:

• [C-2-1] MUST declare the relevant platform features ( android.hardware.bluetooth and android.hardware.bluetooth_le respectively) and implement the platform APIs.
• SHOULD implement relevant Bluetooth profiles such as A2DP, AVRCP, OBEX, HFP, etc. as appropriate for the device.

If device implementations include support for Bluetooth Low Energy (BLE), they:

• [C-3-1] MUST declare the hardware feature android.hardware.bluetooth_le .
• [C-3-2] MUST enable the GATT (generic attribute profile) based Bluetooth APIs as described in the SDK documentation and android.bluetooth .
• [C-3-3] MUST report the correct value for BluetoothAdapter.isOffloadedFilteringSupported() to indicate whether the filtering logic for the ScanFilter API classes is implemented.
• [C-3-4] MUST report the correct value for BluetoothAdapter.isMultipleAdvertisementSupported() to indicate whether Low Energy Advertising is supported.
• [C-3-5] MUST implement a Resolvable Private Address (RPA) timeout no longer than 15 minutes and rotate the address at timeout to protect user privacy when device is actively using BLE for scanning or advertising. To prevent timing attacks, timeout intervals MUST also be randomized between 5 and 15 minutes.
• SHOULD support offloading of the filtering logic to the bluetooth chipset when implementing the ScanFilter API .
• SHOULD support offloading of the batched scanning to the bluetooth chipset.
• SHOULD support multi advertisement with at least 4 slots.

If device implementations support Bluetooth LE and use Bluetooth LE for location scanning, they:

• [C-4-1] MUST provide a user affordance to enable/disable the value read through the System API BluetoothAdapter.isBleScanAlwaysAvailable() .

If device implementations include support for Bluetooth LE and Hearing Aids Profile, as described in Hearing Aid Audio Support Using Bluetooth LE , they:

• [C-5-1] MUST return true for BluetoothAdapter.getProfileProxy(context, listener, BluetoothProfile.HEARING_AID) .

If device implementations include support for Bluetooth or Bluetooth Low Energy, they:

• [C-6-1] MUST restrict access to any Bluetooth metadata (such as scan results) which could be used to derive the location of the device, unless the requesting app successfully passes an android.permission.ACCESS_FINE_LOCATION permission check based on its current foreground/background state.

If device implementations include support for Bluetooth or Bluetooth Low Energy and the app manifest does not include a declaration from the developer stating that they are not deriving location from Bluetooth, then, they:

• [C-6-2] MUST gate Bluetooth access behind the android.permission.ACCESS_FINE_LOCATION .

If device implementations return true for the BluetoothAdapter.isLeAudioSupported() API, then they:

• [C-7-1] MUST support unicast client.
• [C-7-2] MUST support 2M PHY.
• [C-7-3] MUST support LE Extended advertising.
• [C-7-4] MUST support at least 2 CIS connections in a CIG.
• [C-7-5] MUST enable BAP unicast client, CSIP set coordinator, MCP server, VCP controller, CCP server simultaneously.
• [C-SR-1] Are STRONGLY RECOMMENDED to enable HAP unicast client.

If device implementations return true for the BluetoothAdapter.isLeAudioBroadcastSourceSupported() API, then they:

• [C-8-1] MUST support at least 2 BIS links in a BIG.
• [C-8-2] MUST enable BAP broadcast source, BAP broadcast assistant simultaneously.
• [C-8-3] MUST support LE Periodic advertising.

If device implementations return true for the BluetoothAdapter.isLeAudioBroadcastAssistantSupported() API, then they:

• [C-9-1] MUST support PAST (Periodic Advertising Sync Transfer).
• [C-9-2] MUST support LE Periodic advertising.

If device implementations declare FEATURE_BLUETOOTH_LE , they:

• [C-10-1] MUST have RSSI measurements be within +/-9dB for 95% of the measurements at 1m distance from a reference device transmitting at ADVERTISE_TX_POWER_HIGH in line of sight environment.
• [C-10-2] MUST include Rx/Tx corrections to reduce per-channel deviations so that the measurements on each of the 3 channels, on each of the antennas (if multiple are used), are within +/-3dB of one another for 95% of the measurements.
• [C-SR-2] Are STRONGLY RECOMMENDED to measure and compensate for Rx offset to ensure the median BLE RSSI is -60dBm +/-10 dB at 1m distance from a reference device transmitting at ADVERTISE_TX_POWER_HIGH , where devices are oriented such that they are on 'parallel planes' with screens facing the same direction.
• [C-SR-3] Are STRONGLY RECOMMENDED to measure and compensate for Tx offset to ensure the median BLE RSSI is -60dBm +/-10 dB when scanning from a reference device positioned at 1m distance and transmitting at ADVERTISE_TX_POWER_HIGH , where devices are oriented such that they are on 'parallel planes' with screens facing the same direction.

It is STRONGLY RECOMMENDED to follow the measurement setup steps specified in Presence Calibration .

If device implementations support Bluetooth version 5.0, then they:

• [C-SR-4] Are STRONGLY RECOMMENDED to provide support for:
  • LE 2M PHY
  • LE Codec PHY
  • LE Advertising Extension
  • Periodic advertising
  • At least 10 advertisement sets
  • At least 8 LE concurrent connections. Each connection can be in either connection topology roles.
  • LE Link Layer Privacy
  • A "resolving list" size of at least 8 entries

7.4.4. Near-Field Communications

پیاده سازی دستگاه:

• SHOULD include a transceiver and related hardware for Near-Field Communications (NFC).
• [C-0-1] MUST implement android.nfc.NdefMessage and android.nfc.NdefRecord APIs even if they do not include support for NFC or declare the android.hardware.nfc feature as the classes represent a protocol-independent data representation format .

If device implementations include NFC hardware and plan to make it available to third-party apps, they:

• [C-1-1] MUST report the android.hardware.nfc feature from the android.content.pm.PackageManager.hasSystemFeature() method .
• MUST be capable of reading and writing NDEF messages via the following NFC standards as below:
• [C-1-2] MUST be capable of acting as an NFC Forum reader/writer (as defined by the NFC Forum technical specification NFCForum-TS-DigitalProtocol-1.0) via the following NFC standards:
  • NfcA (ISO14443-3A)
  • NfcB (ISO14443-3B)
  • NfcF (JIS X 6319-4)
  • IsoDep (ISO 14443-4)
  • NFC Forum Tag Types 1, 2, 3, 4, 5 (defined by the NFC Forum)

• [C-SR-1] STRONGLY RECOMMENDED to be capable of reading and writing NDEF messages as well as raw data via the following NFC standards. Note that while the NFC standards are stated as STRONGLY RECOMMENDED, the Compatibility Definition for a future version is planned to change these to MUST. These standards are optional in this version but will be required in future versions. Existing and new devices that run this version of Android are very strongly encouraged to meet these requirements now so they will be able to upgrade to the future platform releases.

• [C-1-13] MUST poll for all supported technologies while in NFC discovery mode.

• SHOULD be in NFC discovery mode while the device is awake with the screen active and the lock-screen unlocked.

• SHOULD be capable of reading the barcode and URL (if encoded) of Thinfilm NFC Barcode products.

Note that publicly available links are not available for the JIS, ISO, and NFC Forum specifications cited above.

Android includes support for NFC Host Card Emulation (HCE) mode.

If device implementations include an NFC controller chipset capable of HCE (for NfcA and/or NfcB) and support Application ID (AID) routing, they:

• [C-2-1] MUST report the android.hardware.nfc.hce feature constant.
• [C-2-2] MUST support NFC HCE APIs as defined in the Android SDK.

If device implementations include an NFC controller chipset capable of HCE for NfcF, and implement the feature for third-party applications, they:

• [C-3-1] MUST report the android.hardware.nfc.hcef feature constant.
• [C-3-2] MUST implement the NfcF Card Emulation APIs as defined in the Android SDK.

If device implementations include general NFC support as described in this section and support MIFARE technologies (MIFARE Classic, MIFARE Ultralight, NDEF on MIFARE Classic) in the reader/writer role, they:

• [C-4-1] MUST implement the corresponding Android APIs as documented by the Android SDK.
• [C-4-2] MUST report the feature com.nxp.mifare from the android.content.pm.PackageManager.hasSystemFeature () method. Note that this is not a standard Android feature and as such does not appear as a constant in the android.content.pm.PackageManager class.

7.4.5. Networking protocols and APIs

7.4.5.1. Minimum Network Capability

پیاده سازی دستگاه:

• [C-0-1] MUST include support for one or more forms of data networking. Specifically, device implementations MUST include support for at least one data standard capable of 200 Kbit/sec or greater. Examples of technologies that satisfy this requirement include EDGE, HSPA, EV-DO, 802.11g, Ethernet and Bluetooth PAN.
• SHOULD also include support for at least one common wireless data standard, such as 802.11 (Wi-Fi), when a physical networking standard (such as Ethernet) is the primary data connection.
• MAY implement more than one form of data connectivity.

7.4.5.2. IPv6

پیاده سازی دستگاه:

• [C-0-2] MUST include an IPv6 networking stack and support IPv6 communication using the managed APIs, such as java.net.Socket and java.net.URLConnection , as well as the native APIs, such as AF_INET6 sockets.
• [C-0-3] MUST enable IPv6 by default.
  • MUST ensure that IPv6 communication is as reliable as IPv4, for example:
    • [C-0-4] MUST maintain IPv6 connectivity in doze mode.
    • [C-0-5] Rate-limiting MUST NOT cause the device to lose IPv6 connectivity on any IPv6-compliant network that uses RA lifetimes of at least 180 seconds.
• [C-0-6] MUST provide third-party applications with direct IPv6 connectivity to the network when connected to an IPv6 network, without any form of address or port translation happening locally on the device. Both managed APIs such as Socket#getLocalAddress or Socket#getLocalPort ) and NDK APIs such as getsockname() or IPV6_PKTINFO MUST return the IP address and port that is actually used to send and receive packets on the network and is visible as the source ip and port to internet (web) servers.

The required level of IPv6 support depends on the network type, as shown in the following requirements.

If device implementations support Wi-Fi, they:

• [C-1-1] MUST support dual-stack and IPv6-only operation on Wi-Fi.

If device implementations support Ethernet, they:

• [C-2-1] MUST support dual-stack and IPv6-only operation on Ethernet.

If device implementations support Cellular data, they:

• [C-3-1] MUST support IPv6 operation (IPv6-only and possibly dual-stack) on cellular.

If device implementations support more than one network type (eg, Wi-Fi and cellular data), they:

• [C-4-1] MUST simultaneously meet the above requirements on each network when the device is simultaneously connected to more than one network type.

7.4.5.3. Captive Portals

A captive portal refers to a network that requires sign-in in order to obtain internet access.

If device implementations provide a complete implementation of the android.webkit.Webview API , they:

• [C-1-1] MUST provide a captive portal application to handle the intent ACTION_CAPTIVE_PORTAL_SIGN_IN and display the captive portal login page, by sending that intent, on call to the System API ConnectivityManager#startCaptivePortalApp(Network, Bundle) .
• [C-1-2] MUST perform detection of captive portals and support login through the captive portal application when the device is connected to any network type, including cellular/mobile network, WiFi, Ethernet or Bluetooth.
• [C-1-3] MUST support logging in to captive portals using cleartext DNS when the device is configured to use private DNS strict mode.
• [C-1-4] MUST use encrypted DNS as per the SDK documentation for android.net.LinkProperties.getPrivateDnsServerName and android.net.LinkProperties.isPrivateDnsActive for all network traffic that is not explicitly communicating with the captive portal.
• [C-1-5] MUST ensure that, while the user is logging in to a captive portal, the default network used by applications (as returned by ConnectivityManager.getActiveNetwork , ConnectivityManager.registerDefaultNetworkCallback , and used by default by Java networking APIs such as java.net.Socket, and native APIs such as connect()) is any other available network that provides internet access, if available.

7.4.6. Sync Settings

پیاده سازی دستگاه:

• [C-0-1] MUST have the master auto-sync setting on by default so that the method getMasterSyncAutomatically() returns “true”.

7.4.7. ذخیره داده

If device implementations include a metered connection, they are:

• [C-SR-1] STRONGLY RECOMMENDED to provide the data saver mode.

If device implementations provide the data saver mode, they:

• [C-1-1] MUST support all the APIs in the ConnectivityManager class as described in the SDK documentation

If device implementations do not provide the data saver mode, they:

• [C-2-1] MUST return the value RESTRICT_BACKGROUND_STATUS_DISABLED for ConnectivityManager.getRestrictBackgroundStatus()
• [C-2-2] MUST NOT broadcast ConnectivityManager.ACTION_RESTRICT_BACKGROUND_CHANGED .

7.4.8. Secure Elements

If device implementations support Open Mobile API -capable secure elements and make them available to third-party apps, they:

• [C-1-1] MUST enumerate the available secure elements readers via android.se.omapi.SEService.getReaders() API.

• [C-1-2] MUST declare the correct feature flags via android.hardware.se.omapi.uicc for the device with UICC-based secure elements, android.hardware.se.omapi.ese for the device with eSE-based secure elements and android.hardware.se.omapi.sd for the device with SD-based secure elements.

7.4.9. UWB

If device implementations include support for 802.1.15.4 and expose the functionality to a third-party application, then they:

• [C-1-1] MUST implement the corresponding Android API in android.uwb.
• [C-1-2] MUST report the hardware feature flag android.hardware.uwb.
• [C-1-3] MUST support all the relevant UWB profiles defined in Android implementation.
• [C-1-4] MUST provide a user affordance to allow the user to toggle the UWB radio on/off state.
• [C-1-5] MUST enforce that apps using UWB radio hold UWB_RANGING permission (under NEARBY_DEVICES permission group).

• [C-SR-1] Are STRONGLY RECOMMENDED to pass the relevant conformance and certification tests defined by standard organizations, including FIRA , CCC and CSA .

  • [C-1-6] MUST ensure the distance measurements are within +/-15 cm for 95% of the measurements in the line of sight environment at 1m distance in a non-reflective chamber.
  • [C-1-7] MUST ensure that the median of the distance measurements at 1m from the reference device is within [0.75m, 1.25m], where ground truth distance is measured from the top edge of the DUT held face up and tilted 45 درجه
  • [C-SR-2] Are STRONGLY RECOMMENDED to follow the measurement setup steps specified in Presence Calibration .

7.5. دوربین ها

If device implementations include at least one camera, they:

• [C-1-1] MUST declare the android.hardware.camera.any feature flag.
• [C-1-2] MUST be possible for an application to simultaneously allocate 3 RGBA_8888 bitmaps equal to the size of the images produced by the largest-resolution camera sensor on the device, while camera is open for the purpose of basic preview and still گرفتن
• [C-1-3] MUST ensure that the preinstalled default camera application handling intents MediaStore.ACTION_IMAGE_CAPTURE , MediaStore.ACTION_IMAGE_CAPTURE_SECURE , or MediaStore.ACTION_VIDEO_CAPTURE , is responsible for removing the user location in the image metadata before sending it to the receiving application when the receiving application does not have ACCESS_FINE_LOCATION .

If device implementations support HDR 10-bit output capability, then they:

• [C-2-1] MUST support at least the HLG HDR profile for every camera device that supports 10-bit output.
• [C-2-2] MUST support 10-bit output for either the primary rear-facing or the primary front-facing camera.
• [C-SR-1] Are STRONGLY RECOMMENDED to support 10-bit output for both primary cameras.
• [C-2-3] MUST support the same HDR profiles for all BACKWARD_COMPATIBLE-capable physical sub-cameras of a logical camera, and the logical camera itself.

For Logical camera devices which support 10-bit HDR that implement the android.hardware.camera2.CaptureRequest#CONTROL_ZOOM_RATIO API, they:

• [C-3-1] MUST support switching between all the backwards-compatible physical cameras via the CONTROL_ZOOM_RATIO control on the logical camera.

7.5.1. Rear-Facing Camera

A rear-facing camera is a camera located on the side of the device opposite the display; that is, it images scenes on the far side of the device, like a traditional camera.

پیاده سازی دستگاه:

• SHOULD include a rear-facing camera.

If device implementations include at least one rear-facing camera, they:

• [C-1-1] MUST report the feature flag android.hardware.camera and android.hardware.camera.any .
• [C-1-2] MUST have a resolution of at least 2 megapixels.
• SHOULD have either hardware auto-focus or software auto-focus implemented in the camera driver (transparent to application software).
• MAY have fixed-focus or EDOF (extended depth of field) hardware.
• MAY include a flash.

If the camera includes a flash:

• [C-2-1] the flash lamp MUST NOT be lit while an android.hardware.Camera.PreviewCallback instance has been registered on a Camera preview surface, unless the application has explicitly enabled the flash by enabling the FLASH_MODE_AUTO or FLASH_MODE_ON attributes of a Camera.Parameters object. Note that this constraint does not apply to the device's built-in system camera application, but only to third-party applications using Camera.PreviewCallback .

7.5.2. دوربین جلو

A front-facing camera is a camera located on the same side of the device as the display; that is, a camera typically used to image the user, such as for video conferencing and similar applications.

پیاده سازی دستگاه:

• MAY include a front-facing camera.

If device implementations include at least one front-facing camera, they:

• [C-1-1] MUST report the feature flag android.hardware.camera.any and android.hardware.camera.front .
• [C-1-2] MUST have a resolution of at least VGA (640x480 pixels).
• [C-1-3] MUST NOT use a front-facing camera as the default for the Camera API and MUST NOT configure the API to treat a front-facing camera as the default rear-facing camera, even if it is the only camera روی دستگاه
• [C-1-4] The camera preview MUST be mirrored horizontally relative to the orientation specified by the application when the current application has explicitly requested that the Camera display be rotated via a call to the android.hardware.Camera.setDisplayOrientation() method . Conversely, the preview MUST be mirrored along the device's default horizontal axis when the current application does not explicitly request that the Camera display be rotated via a call to the android.hardware.Camera.setDisplayOrientation() method.
• [C-1-5] MUST NOT mirror the final captured still image or video streams returned to application callbacks or committed to media storage.
• [C-1-6] MUST mirror the image displayed by the postview in the same manner as the camera preview image stream.
• MAY include features (such as auto-focus, flash, etc.) available to rear-facing cameras as described in section 7.5.1 .

If device implementations are capable of being rotated by user (such as automatically via an accelerometer or manually via user input):

• [C-2-1] The camera preview MUST be mirrored horizontally relative to the device's current orientation.

7.5.3. External Camera

پیاده سازی دستگاه:

• MAY include support for an external camera that is not necessarily always connected.

If device implementations include support for an external camera, they:

• [C-1-1] MUST declare the platform feature flag android.hardware.camera.external and android.hardware camera.any .
• [C-1-2] MUST support USB Video Class (UVC 1.0 or higher) if the external camera connects through the USB host port.
• [C-1-3] MUST pass camera CTS tests with a physical external camera device connected. Details of camera CTS testing are available at source.android.com .
• SHOULD support video compressions such as MJPEG to enable transfer of high-quality unencoded streams (ie raw or independently compressed picture streams).
• MAY support multiple cameras.
• MAY support camera-based video encoding.

If camera-based video encoding is supported:

• [C-2-1] A simultaneous unencoded / MJPEG stream (QVGA or greater resolution) MUST be accessible to the device implementation.

7.5.4. Camera API Behavior

Android includes two API packages to access the camera, the newer android.hardware.camera2 API expose lower-level camera control to the app, including efficient zero-copy burst/streaming flows and per-frame controls of exposure, gain, white balance gains, color conversion, denoising, sharpening, and more.

The older API package, android.hardware.Camera , is marked as deprecated in Android 5.0 but as it should still be available for apps to use. Android device implementations MUST ensure the continued support of the API as described in this section and in the Android SDK.

All features that are common between the deprecated android.hardware.Camera class and the newer android.hardware.camera2 package MUST have equivalent performance and quality in both APIs. For example, with equivalent settings, autofocus speed and accuracy must be identical, and the quality of captured images must be the same. Features that depend on the different semantics of the two APIs are not required to have matching speed or quality, but SHOULD match as closely as possible.

Device implementations MUST implement the following behaviors for the camera-related APIs, for all available cameras. پیاده سازی دستگاه:

• [C-0-1] MUST use android.hardware.PixelFormat.YCbCr_420_SP for preview data provided to application callbacks when an application has never called android.hardware.Camera.Parameters.setPreviewFormat(int) .
• [C-0-2] MUST further be in the NV21 encoding format when an application registers an android.hardware.Camera.PreviewCallback instance and the system calls the onPreviewFrame() method and the preview format is YCbCr_420_SP, the data in the byte[] passed into onPreviewFrame() . That is, NV21 MUST be the default.
• [C-0-3] MUST support the YV12 format (as denoted by the android.graphics.ImageFormat.YV12 constant) for camera previews for both front- and rear-facing cameras for android.hardware.Camera . (The hardware video encoder and camera may use any native pixel format, but the device implementation MUST support conversion to YV12.)
• [C-0-4] MUST support the android.hardware.ImageFormat.YUV_420_888 and android.hardware.ImageFormat.JPEG formats as outputs through the android.media.ImageReader API for android.hardware.camera2 devices that advertise REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE capability in android.request.availableCapabilities .
• [C-0-5] MUST still implement the full Camera API included in the Android SDK documentation, regardless of whether the device includes hardware autofocus or other capabilities. For instance, cameras that lack autofocus MUST still call any registered android.hardware.Camera.AutoFocusCallback instances (even though this has no relevance to a non-autofocus camera.) Note that this does apply to front-facing cameras; for instance, even though most front-facing cameras do not support autofocus, the API callbacks must still be “faked” as described.
• [C-0-6] MUST recognize and honor each parameter name defined as a constant in the android.hardware.Camera.Parameters class and the android.hardware.camera2.CaptureRequest class. Conversely, device implementations MUST NOT honor or recognize string constants passed to the android.hardware.Camera.setParameters() method other than those documented as constants on the android.hardware.Camera.Parameters . That is, device implementations MUST support all standard Camera parameters if the hardware allows, and MUST NOT support custom Camera parameter types. For instance, device implementations that support image capture using high dynamic range (HDR) imaging techniques MUST support camera parameter Camera.SCENE_MODE_HDR .
• [C-0-7] MUST report the proper level of support with the android.info.supportedHardwareLevel property as described in the Android SDK and report the appropriate framework feature flags .
• [C-0-8] MUST also declare its individual camera capabilities of android.hardware.camera2 via the android.request.availableCapabilities property and declare the appropriate feature flags ; MUST define the feature flag if any of its attached camera devices supports the feature.
• [C-0-9] MUST broadcast the Camera.ACTION_NEW_PICTURE intent whenever a new picture is taken by the camera and the entry of the picture has been added to the media store.
• [C-0-10] MUST broadcast the Camera.ACTION_NEW_VIDEO intent whenever a new video is recorded by the camera and the entry of the picture has been added to the media store.
• [C-0-11] MUST have all cameras accessible via the deprecated android.hardware.Camera API also accessible via the android.hardware.camera2 API.
• [C-0-12] MUST ensure that the facial appearance is NOT altered, including but not limited to altering facial geometry, facial skin tone, or facial skin smoothening for any android.hardware.camera2 or android.hardware.Camera API.
• [C-SR-1] For devices with multiple RGB cameras facing in the same direction, are STRONGLY RECOMMENDED to support a logical camera device that lists capability CameraMetadata.REQUEST_AVAILABLE_CAPABILITIES_LOGICAL_MULTI_CAMERA , consisting of all of the RGB cameras facing that direction as physical sub-devices .

If device implementations provide a proprietary camera API to 3rd-party apps, they:

• [C-1-1] MUST implement such a camera API using android.hardware.camera2 API.
• MAY provide vendor tags and/or extensions to android.hardware.camera2 API.

7.5.5. Camera Orientation

If device implementations have a front- or a rear-facing camera, such camera(s):

• [C-1-1] MUST be oriented so that the long dimension of the camera aligns with the screen's long dimension. That is, when the device is held in the landscape orientation, cameras MUST capture images in the landscape orientation. This applies regardless of the device's natural orientation; that is, it applies to landscape-primary devices as well as portrait-primary devices.

Devices that fulfill all of the following criteria are exempt from the requirement above:

• The device implements variable-geometry screens, such as foldable or hinged displays.
• When the device's fold or hinge state changes, the device switches between portrait-primary to landscape-primary (or vice-versa) orientations.

7.6. حافظه و ذخیره سازی

7.6.1. Minimum Memory and Storage

پیاده سازی دستگاه:

• [C-0-1] MUST include a Download Manager that applications MAY use to download data files and they MUST be capable of downloading individual files of at least 100MB in size to the default "cache" location.

7.6.2. Application Shared Storage

پیاده سازی دستگاه:

• [C-0-1] MUST offer storage to be shared by applications, also often referred as "shared external storage", "application shared storage" or by the Linux path "/sdcard" it is mounted on.
• [C-0-2] MUST be configured with shared storage mounted by default, in other words "out of the box", regardless of whether the storage is implemented on an internal storage component or a removable storage medium (eg Secure Digital card slot ).
• [C-0-3] MUST mount the application shared storage directly on the Linux path sdcard or include a Linux symbolic link from sdcard to the actual mount point.
• [C-0-4] MUST enable scoped storage by default for all apps targeting API level 29 or above, except in the following situation:
  • When the app has requested android:requestLegacyExternalStorage="true" in their manifest.
• [C-0-5] MUST redact location metadata, such as GPS Exif tags, stored in media files when those files are accessed through MediaStore , except when the calling app holds the ACCESS_MEDIA_LOCATION permission.

Device implementations MAY meet the above requirements using either of the following:

• User-accessible removable storage, such as a Secure Digital (SD) card slot.
• A portion of the internal (non-removable) storage as implemented in the Android Open Source Project (AOSP).

If device implementations use removable storage to satisfy the above requirements, they:

• [C-1-1] MUST implement a toast or pop-up user interface warning the user when there is no storage medium inserted in the slot.
• [C-1-2] MUST include a FAT-formatted storage medium (eg SD card) or show on the box and other material available at time of purchase that the storage medium has to be purchased separately.

If device implementations use a portion of the non-removable storage to satisfy the above requirements, they:

• SHOULD use the AOSP implementation of the internal application shared storage.
• MAY share the storage space with the application private data.

If device implementations have a USB port with USB peripheral mode support, they:

• [C-3-1] MUST provide a mechanism to access the data on the application shared storage from a host computer.
• SHOULD expose content from both storage paths transparently through Android's media scanner service and android.provider.MediaStore .
• MAY use USB mass storage, but SHOULD use Media Transfer Protocol to satisfy this requirement.

If device implementations have a USB port with USB peripheral mode and support Media Transfer Protocol, they:

• SHOULD be compatible with the reference Android MTP host, Android File Transfer .
• SHOULD report a USB device class of 0x00.
• SHOULD report a USB interface name of 'MTP'.

7.6.3. Adoptable Storage

If the device is expected to be mobile in nature unlike Television, device implementations are:

• [C-SR-1] STRONGLY RECOMMENDED to implement the adoptable storage in a long-term stable location, since accidentally disconnecting them can cause data loss/corruption.

If the removable storage device port is in a long-term stable location, such as within the battery compartment or other protective cover, device implementations are:

• [C-SR-2] STRONGLY RECOMMENDED to implement adoptable storage .

7.7. USB

If device implementations have a USB port, they:

• SHOULD support USB peripheral mode and SHOULD support USB host mode.
• SHOULD support disabling data signaling over USB.

7.7.1. USB peripheral mode

If device implementations include a USB port supporting peripheral mode:

• [C-1-1] The port MUST be connectable to a USB host that has a standard type-A or type-C USB port.
• [C-1-2] MUST report the correct value of iSerialNumber in USB standard device descriptor through android.os.Build.SERIAL .
• [C-1-3] MUST detect 1.5A and 3.0A chargers per the Type-C resistor standard and MUST detect changes in the advertisement if they support Type-C USB.
• [C-SR-1] The port SHOULD use micro-B, micro-AB or Type-C USB form factor. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to the future platform releases.
• [C-SR-2] The port SHOULD be located on the bottom of the device (according to natural orientation) or enable software screen rotation for all apps (including home screen), so that the display draws correctly when the device is oriented with the port at bottom. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to future platform releases.
• [C-SR-3] SHOULD implement support to draw 1.5 A current during HS chirp and traffic as specified in the USB Battery Charging specification, revision 1.2 . Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to the future platform releases.
• [C-SR-4] STRONGLY RECOMMENDED to not support proprietary charging methods that modify Vbus voltage beyond default levels, or alter sink/source roles as such may result in interoperability issues with the chargers or devices that support the standard USB Power Delivery methods. While this is called out as "STRONGLY RECOMMENDED", in future Android versions we might REQUIRE all type-C devices to support full interoperability with standard type-C chargers.
• [C-SR-5] STRONGLY RECOMMENDED to support Power Delivery for data and power role swapping when they support Type-C USB and USB host mode.
• SHOULD support Power Delivery for high-voltage charging and support for Alternate Modes such as display out.
• SHOULD implement the Android Open Accessory (AOA) API and specification as documented in the Android SDK documentation.

If device implementations include a USB port and implement the AOA specification, they:

• [C-2-1] MUST declare support for the hardware feature android.hardware.usb.accessory .
• [C-2-2] The USB mass storage class MUST include the string "android" at the end of the interface description iInterface string of the USB mass storage

7.7.2. USB host mode

If device implementations include a USB port supporting host mode, they:

• [C-1-1] MUST implement the Android USB host API as documented in the Android SDK and MUST declare support for the hardware feature android.hardware.usb.host .
• [C-1-2] MUST implement support to connect standard USB peripherals, in other words, they MUST either:
  • Have an on-device type C port or ship with cable(s) adapting an on-device proprietary port to a standard USB type-C port (USB Type-C device).
  • Have an on-device type A or ship with cable(s) adapting an on-device proprietary port to a standard USB type-A port.
  • Have an on-device micro-AB port, which SHOULD ship with a cable adapting to a standard type-A port.
• [C-1-3] MUST NOT ship with an adapter converting from USB type A or micro-AB ports to a type-C port (receptacle).
• [C-SR-1] Are STRONGLY RECOMMENDED to implement the USB audio class as documented in the Android SDK documentation.
• SHOULD support charging the connected USB peripheral device while in host mode; advertising a source current of at least 1.5A as specified in the Termination Parameters section of the USB Type-C Cable and Connector Specification Revision 1.2 for USB Type-C connectors or using Charging Downstream Port(CDP) output current range as specified in the USB Battery Charging specifications, revision 1.2 for Micro-AB connectors.
• SHOULD implement and support USB Type-C standards.

If device implementations include a USB port supporting host mode and the USB audio class, they:

• [C-2-1] MUST support the USB HID class .
• [C-2-2] MUST support the detection and mapping of the following HID data fields specified in the USB HID Usage Tables and the Voice Command Usage Request to the KeyEvent constants as below:
  • Usage Page (0xC) Usage ID (0x0CD): KEYCODE_MEDIA_PLAY_PAUSE
  • Usage Page (0xC) Usage ID (0x0E9): KEYCODE_VOLUME_UP
  • Usage Page (0xC) Usage ID (0x0EA): KEYCODE_VOLUME_DOWN
  • Usage Page (0xC) Usage ID (0x0CF): KEYCODE_VOICE_ASSIST

If device implementations include a USB port supporting host mode and the Storage Access Framework (SAF), they:

• [C-3-1] MUST recognize any remotely connected MTP (Media Transfer Protocol) devices and make their contents accessible through the ACTION_GET_CONTENT , ACTION_OPEN_DOCUMENT , and ACTION_CREATE_DOCUMENT intents. .

If device implementations include a USB port supporting host mode and USB Type-C, they:

• [C-4-1] MUST implement Dual Role Port functionality as defined by the USB Type-C specification (section 4.5.1.3.3). For Dual Role Ports, On devices that include a 3.5mm audio jack, the USB sink detection (host mode) MAY be off by default but it MUST be possible for the user to enable it.
• [C-SR-2] STRONGLY RECOMMENDED to support DisplayPort, SHOULD support USB SuperSpeed Data Rates, and are STRONGLY RECOMMENDED to support Power Delivery for data and power role swapping.
• [C-SR-3] STRONGLY RECOMMENDED to NOT support Audio Adapter Accessory Mode as described in the Appendix A of the USB Type-C Cable and Connector Specification Revision 1.2 .
• SHOULD implement the Try.* model that is most appropriate for the device form factor. For example a handheld device SHOULD implement the Try.SNK model.

7.8. صوتی

7.8.1. میکروفون

If device implementations include a microphone, they:

• [C-1-1] MUST report the android.hardware.microphone feature constant.
• [C-1-2] MUST meet the audio recording requirements in section 5.4 .
• [C-1-3] MUST meet the audio latency requirements in section 5.6 .
• [C-SR-1] Are STRONGLY RECOMMENDED to support near-ultrasound recording as described in section 7.8.3 .

If device implementations omit a microphone, they:

• [C-2-1] MUST NOT report the android.hardware.microphone feature constant.
• [C-2-2] MUST implement the audio recording API at least as no-ops, per section 7 .

7.8.2. خروجی صدا

If device implementations include a speaker or an audio/multimedia output port for an audio output peripheral such as a 4 conductor 3.5mm audio jack or USB host mode port using USB audio class , they:

• [C-1-1] MUST report the android.hardware.audio.output feature constant.
• [C-1-2] MUST meet the audio playback requirements in section 5.5 .
• [C-1-3] MUST meet the audio latency requirements in section 5.6 .
• [C-SR-1] STRONGLY RECOMMENDED to support near-ultrasound playback as described in section 7.8.3 .

If device implementations do not include a speaker or audio output port, they:

• [C-2-1] MUST NOT report the android.hardware.audio.output feature.
• [C-2-2] MUST implement the Audio Output related APIs as no-ops at least.

For the purposes of this section, an "output port" is a physical interface such as a 3.5mm audio jack, HDMI, or USB host mode port with USB audio class. Support for audio output over radio-based protocols such as Bluetooth, WiFi, or cellular network does not qualify as including an "output port".

7.8.2.1. Analog Audio Ports

In order to be compatible with the headsets and other audio accessories using the 3.5mm audio plug across the Android ecosystem, if device implementations include one or more analog audio ports, they:

• [C-SR-1] Are STRONGLY RECOMMENDED to include at least one of the audio port(s) to be a 4 conductor 3.5mm audio jack.

If device implementations have a 4 conductor 3.5mm audio jack, they:

• [C-1-1] MUST support audio playback to stereo headphones and stereo headsets with a microphone.
• [C-1-2] MUST support TRRS audio plugs with the CTIA pin-out order.
• [C-1-3] MUST support the detection and mapping to the keycodes for the following 3 ranges of equivalent impedance between the microphone and ground conductors on the audio plug:
  • 70 ohm or less : KEYCODE_HEADSETHOOK
  • 210-290 ohm : KEYCODE_VOLUME_UP
  • 360-680 ohm : KEYCODE_VOLUME_DOWN
• [C-1-4] MUST trigger ACTION_HEADSET_PLUG upon a plug insert, but only after all contacts on plug are touching their relevant segments on the jack.
• [C-1-5] MUST be capable of driving at least 150mV ± 10% of output voltage on a 32 ohm speaker impedance.
• [C-1-6] MUST have a microphone bias voltage between 1.8V ~ 2.9V.
• [C-1-7] MUST detect and map to the keycode for the following range of equivalent impedance between the microphone and ground conductors on the audio plug:
  • 110-180 ohm: KEYCODE_VOICE_ASSIST
• [C-SR-2] Are STRONGLY RECOMMENDED to support audio plugs with the OMTP pin-out order.
• [C-SR-3] Are STRONGLY RECOMMENDED to support audio recording from stereo headsets with a microphone.

If device implementations have a 4 conductor 3.5mm audio jack and support a microphone, and broadcast the android.intent.action.HEADSET_PLUG with the extra value microphone set as 1, they:

• [C-2-1] MUST support the detection of microphone on the plugged in audio accessory.

7.8.2.2. Digital Audio Ports

See Section 2.2.1 for device-specific requirements.

7.8.3. Near-Ultrasound

Near-Ultrasound audio is the 18.5 kHz to 20 kHz band.

پیاده سازی دستگاه:

• MUST correctly report the support of near-ultrasound audio capability via the AudioManager.getProperty API as follows:

If PROPERTY_SUPPORT_MIC_NEAR_ULTRASOUND is "true", the following requirements MUST be met by the VOICE_RECOGNITION and UNPROCESSED audio sources:

• [C-1-1] The microphone's mean power response in the 18.5 kHz to 20 kHz band MUST be no more than 15 dB below the response at 2 kHz.
• [C-1-2] The microphone's unweighted signal to noise ratio over 18.5 kHz to 20 kHz for a 19 kHz tone at -26 dBFS MUST be no lower than 50 dB.

If PROPERTY_SUPPORT_SPEAKER_NEAR_ULTRASOUND is "true":

• [C-2-1] The speaker's mean response in 18.5 kHz - 20 kHz MUST be no lower than 40 dB below the response at 2 kHz.

7.8.4. Signal Integrity

پیاده سازی دستگاه:

• SHOULD provide a glitch-free audio signal path for both input and output streams on handheld devices, as defined by zero glitches measured during a test of one minute per path. Test using OboeTester “Automated Glitch Test”.

The test requires an audio loopback dongle , used directly in a 3.5mm jack, and/or in combination with a USB-C to 3.5mm adapter. All audio output ports SHOULD be tested.

OboeTester currently supports AAudio paths, so the following combinations SHOULD be tested for glitches using AAudio:

A reliable stream SHOULD meet the following criteria for Signal to Noise Ratio (SNR) and Total Harmonic Distortion (THD) for 2000 Hz sine.

7.9. واقعیت مجازی

Android includes APIs and facilities to build "Virtual Reality" (VR) applications including high quality mobile VR experiences. Device implementations MUST properly implement these APIs and behaviors, as detailed in this section.

7.9.1. Virtual Reality Mode

Android includes support for VR Mode , a feature which handles stereoscopic rendering of notifications and disables monocular system UI components while a VR application has user focus.

7.9.2. Virtual Reality Mode - High Performance

If device implementations support VR mode, they:

• [C-1-1] MUST have at least 2 physical cores.
• [C-1-2] MUST declare the android.hardware.vr.high_performance feature.
• [C-1-3] MUST support sustained performance mode.
• [C-1-4] MUST support OpenGL ES 3.2.
• [C-1-5] MUST support android.hardware.vulkan.level 0.
• SHOULD support android.hardware.vulkan.level 1 or higher.
• [C-1-6] MUST implement EGL_KHR_mutable_render_buffer , EGL_ANDROID_front_buffer_auto_refresh , EGL_ANDROID_get_native_client_buffer , EGL_KHR_fence_sync , EGL_KHR_wait_sync , EGL_IMG_context_priority , EGL_EXT_protected_content , EGL_EXT_image_gl_colorspace , and expose the extensions in the list of available EGL extensions.
• [C-1-8] MUST implement GL_EXT_multisampled_render_to_texture2 , GL_OVR_multiview , GL_OVR_multiview2 , GL_EXT_protected_textures , and expose the extensions in the list of available GL extensions.
• [C-SR-1] Are STRONGLY RECOMMENDED to implement GL_EXT_external_buffer , GL_EXT_EGL_image_array , GL_OVR_multiview_multisampled_render_to_texture , and expose the extensions in the list of available GL extensions.
• [C-SR-2] Are STRONGLY RECOMMENDED to support Vulkan 1.1.
• [C-SR-3] Are STRONGLY RECOMMENDED to implement VK_ANDROID_external_memory_android_hardware_buffer , VK_GOOGLE_display_timing , VK_KHR_shared_presentable_image , and expose it in the list of available Vulkan extensions.
• [C-SR-4] Are STRONGLY RECOMMENDED to expose at least one Vulkan queue family where flags contain both VK_QUEUE_GRAPHICS_BIT and VK_QUEUE_COMPUTE_BIT , and queueCount is at least 2.
• [C-1-7] The GPU and display MUST be able to synchronize access to the shared front buffer such that alternating-eye rendering of VR content at 60fps with two render contexts will be displayed with no visible tearing artifacts.
• [C-1-9] MUST implement support for AHardwareBuffer flags AHARDWAREBUFFER_USAGE_GPU_DATA_BUFFER , AHARDWAREBUFFER_USAGE_SENSOR_DIRECT_DATA and AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT as described in the NDK.
• [C-1-10] MUST implement support for AHardwareBuffer s with any combination of the usage flags AHARDWAREBUFFER_USAGE_GPU_COLOR_OUTPUT , AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE , AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT for at least the following formats: AHARDWAREBUFFER_FORMAT_R5G6B5_UNORM , AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM , AHARDWAREBUFFER_FORMAT_R10G10B10A2_UNORM , AHARDWAREBUFFER_FORMAT_R16G16B16A16_FLOAT .
• [C-SR-5] Are STRONGLY RECOMMENDED to support the allocation of AHardwareBuffer s with more than one layer and flags and formats specified in C-1-10.
• [C-1-11] MUST support H.264 decoding at least 3840 x 2160 at 30fps, compressed to an average of 40Mbps (equivalent to 4 instances of 1920 x1080 at 30 fps-10 Mbps or 2 instances of 1920 x 1080 at 60 fps-20 Mbps).
• [C-1-12] MUST support HEVC and VP9, MUST be capable of decoding at least 1920 x 1080 at 30 fps compressed to an average of 10 Mbps and SHOULD be capable of decoding 3840 x 2160 at 30 fps-20 Mbps (equivalent to 4 instances of 1920 x 1080 at 30 fps-5 Mbps).
• [C-1-13] MUST support HardwarePropertiesManager.getDeviceTemperatures API and return accurate values for skin temperature.
• [C-1-14] MUST have an embedded screen, and its resolution MUST be at least 1920 x 1080.
• [C-SR-6] Are STRONGLY RECOMMENDED to have a display resolution of at least 2560 x 1440.
• [C-1-15] The display MUST update at least 60 Hz while in VR Mode.
• [C-1-17] The display MUST support a low-persistence mode with ≤ 5 milliseconds persistence, persistence being defined as the amount of time for which a pixel is emitting light.
• [C-1-18] MUST support Bluetooth 4.2 and Bluetooth LE Data Length Extension section 7.4.3 .
• [C-1-19] MUST support and properly report Direct Channel Type for all of the following default sensor types:
  • TYPE_ACCELEROMETER
  • TYPE_ACCELEROMETER_UNCALIBRATED
  • TYPE_GYROSCOPE
  • TYPE_GYROSCOPE_UNCALIBRATED
  • TYPE_MAGNETIC_FIELD
  • TYPE_MAGNETIC_FIELD_UNCALIBRATED
• [C-SR-7] Are STRONGLY RECOMMENDED to support the TYPE_HARDWARE_BUFFER direct channel type for all Direct Channel Types listed above.
• [C-1-21] MUST meet the gyroscope, accelerometer, and magnetometer related requirements for android.hardware.hifi_sensors , as specified in section 7.3.9 .
• [C-SR-8] Are STRONGLY RECOMMENDED to support the android.hardware.sensor.hifi_sensors feature.
• [C-1-22] MUST have end-to-end motion to photon latency not higher than 28 milliseconds.
• [C-SR-9] Are STRONGLY RECOMMENDED to have end-to-end motion to photon latency not higher than 20 milliseconds.
• [C-1-23] MUST have first-frame ratio, which is the ratio between the brightness of pixels on the first frame after a transition from black to white and the brightness of white pixels in steady state, of at least 85%.
• [C-SR-10] Are STRONGLY RECOMMENDED to have first-frame ratio of at least 90%.
• MAY provide an exclusive core to the foreground application and MAY support the Process.getExclusiveCores API to return the numbers of the cpu cores that are exclusive to the top foreground application.

If exclusive core is supported, then the core:

• [C-2-1] MUST not allow any other userspace processes to run on it (except device drivers used by the application), but MAY allow some kernel processes to run as necessary.

7.10. هپتیک

See Section 2.2.1 for device-specific requirements.

7.11. Media Performance Class

The media performance class of the device implementation can be obtained from the android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS API. Requirements for media performance class are defined for each Android version starting with R (version 30). The special value of 0 designates that the device is not of a media performance class.

If device implementations return non-zero value for android.os.Build.VERSION_CODES.MEDIA_PERFORMANCE_CLASS , they:

• [C-1-1] MUST return at least a value of android.os.Build.VERSION_CODES.R .

• [C-1-2] MUST be a handheld device implementation.

• [C-1-3] MUST meet all requirements for "Media Performance Class" described in section 2.2.7 .

In other words, media performance class in Android T is only defined for handheld devices at version T, S or R.

See section 2.2.7 for device-specific requirements.

8. Performance and Power

Some minimum performance and power criteria are critical to the user experience and impact the baseline assumptions developers would have when developing an app.

8.1. User Experience Consistency

A smooth user interface can be provided to the end user if there are certain minimum requirements to ensure a consistent frame rate and response times for applications and games. Device implementations, depending on the device type, MAY have measurable requirements for the user interface latency and task switching as described in section 2 .

8.2. File I/O Access Performance

Providing a common baseline for a consistent file access performance on the application private data storage ( /data partition) allows app developers to set a proper expectation that would help their software design. Device implementations, depending on the device type, MAY have certain requirements described in section 2 for the following read and write operations: